[VBLOCKS-2877] Prepare repo for GA release

[mhuynh5757]

Submission Checklist

• [x] The README.md reflects new features
• [x] The CHANGELOG.md reflects any feature, bug fixes, or known issues made in the source code
• [x] New unit tests and integration tests have beed added
• [x] Code coverage is more or equal to the previous coverage
• [x] A visual inspection of the Files changed tab was made prior to submitting the pull request ensuring the style guide was followed
• [x] CI pipeline is green
• [x] Included screenshot if necessary

Description

This PR prepares the repo for GA release by removing Beta tags where applicable and updating changelogs.

Breakdown

• Update changelog to version 1.0.0.
• Update Voice SDK dependency to 1.0.0.

Validation

• Manually tested and built the app with 1.0.0.

[x] android
  [x] outgoing call
    [x] accept
      [x] disconnect by remote
      [x] disconnect by local
    [x] reject
    [x] cancel
  [x] incoming call
    [x] tap on notification
      [x] js accept
        [x] disconnect by remote
        [x] disconnect by local
      [x] js reject
      [x] cancel
    [x] native accept
      [x] disconnect by remote
      [x] disconnect by local
    [x] native reject
    [x] cancel

[x] ios
  [x] outgoing call
    [x] accept
      [x] disconnect by remote
      [x] disconnect by local
    [x] reject
    [x] cancel
  [x] incoming call
    [x] tap on notification
      [x] callkit accept
        [x] disconnect by remote
        [x] disconnect by local
      [x] callkit reject
      [x] cancel
    [x] do not tap on notification
      [x] native accept
        [x] disconnect by remote
        [x] disconnect by local
      [x] native reject
      [x] cancel

Additional Notes

N/A

Contributing to Twilio

All third-party contributors acknowledge that any contributions they provide will be made under the same open-source license that the open-source project is provided under.

• [x] I acknowledge that all my contributions will be made under the project's license.