[MOB-10637] Add Overridable String Keys

[DavidMina96]

Description of the change

Add these string keys: okButtonText, audio, image, screenRecording, messagesNotificationAndOthers, insufficientContentTitle, insufficientContentMessage with their mapping on both platforms (if relevant).

Note:
This is based on an internal snapshot, so the Android tests are expected to fail until we bump to the Android release including the new keys.

To-Do:
Rebase the PR after bumping the Android version ✅

Type of change

• Bug fix (non-breaking change that fixes an issue)
• New feature (non-breaking change that adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)

Related issues

Issue links go here

Checklists

Development

• Lint rules pass locally
• The code changed/added as part of this pull request has been covered with tests

Code review

• This pull request has a descriptive title and information useful to a reviewer
• Issue from task tracker has a link to this pull request

[codecov]

Codecov Report

Merging #305 (47c0b70) into dev (c7f8142) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##              dev     #305   +/-   ##
=======================================
  Coverage   83.92%   83.92%           
=======================================
  Files          17       17           
  Lines         367      367           
=======================================
  Hits          308      308           
  Misses         59       59           

Impacted Files	Coverage Δ
lib/src/modules/instabug.dart	97.61% <ø> (ø)

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