Feature: Add support of "search_paths" to fd.

[alexhuot1]

Have you RTFM'd?

• I have done proper research

Feature Request

As discussed here: #1674

live_grep (and other grep commands) now support "search_paths" to specify which folder will be searched. It would be great to have the same functionality for the "files" command (fd).

Very similar to telescope, where "search_dirs" works for greps and find_files.

fd itself supports multiple root directories.

From fd documentation:

Usage: fd [OPTIONS] [pattern] [path]...

Arguments:
  [pattern]  the search pattern (a regular expression, unless '--glob' is used; optional)
  [path]...  the root directories for the filesystem search (optional)

[ibhagwan]

@alexhuot1 FYI, fc2c15a.