Update README and examples to reflect v1 changes (#107)

## Problem

We are close to launching v1! With it, our README needs a facelift. Here
is that facelift 💅.
We have also updated the SDK version, user-agent string, and the
examples package.

Asana tix: 
- Audrey: https://app.asana.com/0/1203260648987893/1207042384514994/f
- Rohan: https://app.asana.com/0/1203260648987893/1206745140276838/f

## Solution

Update README, user-agent string, and examples for v1 java SDK. We have
currently removed the UpsertsAndQueriesConcurrentExample example but in
upcoming PR's, we will like to add it back.

## Type of Change

- [ ] Bug fix (non-breaking change which fixes an issue)
- [ ] New feature (non-breaking change which adds functionality)
- [ ] Breaking change (fix or feature that would cause existing
functionality to not work as expected)
- [ ] This change requires a documentation update
- [ ] Infrastructure change (CI configs, etc)
- [x] Non-code change (docs, etc)
- [ ] None of the above: (explain here)

---------

Co-authored-by: rohanshah18 <[email protected]>
Co-authored-by: Dave Rigby <[email protected]>

Author: 3 people

CHANGELOG.md

@@ -2,6 +2,12 @@
 
 [comment]: <> (When bumping [pc:VERSION_LATEST_RELEASE] create a new entry below)
 ### Unreleased version
+### v1.0.0
+- Remove vector_service.proto and replace it with the generated classes
+- Add data and control plane wrappers
+- Refactor configs and PineconeConnection
+- Add source tag
+
 ### v0.8.0
 - Add support for control plane operations for serverless indexes
 - Add support for collections for pod indexes