feat(ios): add native-side init API for startup crashes

[a7medev]

Description of the change

Provide a native iOS-side init API that allows starting the SDK early (and before the JavaScript has started) in the app lifecycle allowing them to capture early crashes in their app.

1. Added [RNInstabug initWithToken:invocationEvents:] and [RNInstabug initWithToken:invocationEvents:debugLogsLevel:] APIs.
2. Refactored the native module method for Instabug.init to use RNInstabug internally.

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

Jira ID: MOB-13246

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

[InstabugCI]

Coverage Report

Label	Coverage	Status
JavaScript	95.8%	✅
Android	50.3%	✅
iOS	40.6%	✅

Generated by 🚫 dangerJS against 8a3ecc2

[abdelhamid-f-nasser]

Great job as always 🟢 👌