cli: Add new rad inbox command

Shows you updates on local repositories.

Included here is a basic implementation of a notification system. A new
database is created and updated after every fetch, with refs that have
changed.

The `rad inbox` command can then list items in the database and delete
them.

radicle-cli/examples/rad-inbox.md

@@ -0,0 +1,108 @@
+``` ~alice
+$ cd heartwood
+$ rad inbox
+Your inbox is empty.
+```
+
+``` ~bob
+$ cd heartwood
+$ rad issue open --title "No license file" --description "..." -q
+✓ Synced with 1 node(s)
+$ git commit -m "Change copyright" --allow-empty -q
+$ git push rad HEAD:bob/copy
+$ cd ..
+$ cd radicle-git
+$ git commit -m "Change copyright" --allow-empty -q
+$ git push rad -o patch.message="Copyright fixes" HEAD:refs/patches
+```
+
+``` ~alice
+$ rad inbox --sort-by id
+╭──────────────────────────────────────────────────────────────╮
+│ heartwood                                                    │
+├──────────────────────────────────────────────────────────────┤
+│ 1   ●   issue    No license file    [  ..  ]   opened    now │
+│ 2   ●   branch   Change copyright   bob/copy   created   now │
+╰──────────────────────────────────────────────────────────────╯
+```
+
+``` ~alice
+$ rad inbox --all --sort-by id
+╭──────────────────────────────────────────────────────────────╮
+│ heartwood                                                    │
+├──────────────────────────────────────────────────────────────┤
+│ 1   ●   issue    No license file    [  ..  ]   opened    now │
+│ 2   ●   branch   Change copyright   bob/copy   created   now │
+╰──────────────────────────────────────────────────────────────╯
+╭──────────────────────────────────────────────────────────╮
+│ radicle-git                                              │
+├──────────────────────────────────────────────────────────┤
+│ 3   ●   patch   Copyright fixes   [ ... ]   opened   now │
+╰──────────────────────────────────────────────────────────╯
+```
+
+``` ~alice
+$ rad inbox show 2
+commit 141c9073066e3910f1dfe356904a0120542e1cc9
+Author: radicle <radicle@localhost>
+Date:   Thu Dec 15 17:28:04 2022 +0000
+
+    Change copyright
+
+commit f2de534b5e81d7c6e2dcaf58c3dd91573c0a0354
+Author: anonymous <[email protected]>
+Date:   Mon Jan 1 14:39:16 2018 +0000
+
+    Second commit
+
+commit 08c788dd1be6315de09e3fe09b5b1b7a2b8711d9
+Author: anonymous <[email protected]>
+Date:   Mon Jan 1 14:39:16 2018 +0000
+
+    Initial commit
+```
+
+``` ~alice
+$ rad inbox list --sort-by id
+╭──────────────────────────────────────────────────────────────╮
+│ heartwood                                                    │
+├──────────────────────────────────────────────────────────────┤
+│ 1   ●   issue    No license file    [ ... ]    opened    now │
+│ 2       branch   Change copyright   bob/copy   created   now │
+╰──────────────────────────────────────────────────────────────╯
+```
+
+``` ~alice
+$ rad inbox show 1
+╭──────────────────────────────────────────────────╮
+│ Title   No license file                          │
+│ Issue   [ ...                                  ] │
+│ Author  bob z6Mkt67…v4N1tRk                      │
+│ Status  open                                     │
+│                                                  │
+│ ...                                              │
+╰──────────────────────────────────────────────────╯
+```
+
+``` ~alice
+$ rad inbox clear
+✓ Cleared 2 item(s) from your inbox
+$ rad inbox
+Your inbox is empty.
+$ rad inbox --all
+╭──────────────────────────────────────────────────────────╮
+│ radicle-git                                              │
+├──────────────────────────────────────────────────────────┤
+│ 3   ●   patch   Copyright fixes   [ ... ]   opened   now │
+╰──────────────────────────────────────────────────────────╯
+```
+
+``` ~alice
+$ rad inbox clear --all
+✓ Cleared 1 item(s) from your inbox
+```
+
+``` ~alice
+$ rad inbox clear --all
+Your inbox is empty.
+```

radicle-cli/examples/workflow/5-patching-maintainer.md

@@ -16,6 +16,13 @@ $ rad remote add z6Mkt67GdsW7715MEfRuP4pSZxJRJh6kj6Y48WRqVv4N1tRk --name bob --s
 The contributor's changes are now visible to us.
 
 ```
+$ rad inbox --sort-by id
+╭──────────────────────────────────────────────────────────────────────╮
+│ heartwood                                                            │
+├──────────────────────────────────────────────────────────────────────┤
+│ 1   ●   issue   flux capacitor underpowered   d060989   opened   now │
+│ 2   ●   patch   Define power requirements     a99d55e   opened   now │
+╰──────────────────────────────────────────────────────────────────────╯
 $ git branch -r
   bob/patches/a99d55e5958a8c52ff7efbc8ff000d9bbdac79c7
   rad/master

radicle-cli/src/commands.rs

@@ -20,6 +20,8 @@ pub mod rad_fork;
 pub mod rad_help;
 #[path = "commands/id.rs"]
 pub mod rad_id;
+#[path = "commands/inbox.rs"]
+pub mod rad_inbox;
 #[path = "commands/init.rs"]
 pub mod rad_init;
 #[path = "commands/inspect.rs"]