feat(SDK-2101): add setrequestmetadata public method

[JagadeeshKaricherla-branch]

Add setrequestmetadata public method

Pull Request Template

Description

exposes a new public method setRequestMetadata which sets specific key/value pairs to be sent to all API requests. This is required for integrating with partners like Adobe Analytics, Amplitude, etc.
setRequestMetadata(String key, String value)

example usage :
branch.setRequestMetaData("key1","value1");

live view on dashboard with the metadata

Fixes # (issue) : SDK-2101

Type of change

Please delete options that are not relevant.

• 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

How Has This Been Tested?

Please describe the tests that you ran to verify your changes. Provide instructions so we can reproduce. Please also list any relevant details for your test configuration

• Unit test
• Integration test

JS Budget Check

Please mention the size in kb before abd after this PR

Files	Before	After
dist/build.js.
dist/build.min.js

Checklist:

• My code follows the style guidelines of this project
• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• My changes generate no new warnings
• I have added tests that prove my fix is effective or that my feature works
• New and existing unit tests pass locally with my changes
• Any dependent changes have been merged and published in downstream modules
• I have checked my code and corrected any misspellings

Mentions:

List the person or team responsible for reviewing proposed changes.

cc @BranchMetrics/saas-sdk-devs for visibility.

[github-actions]

Test Results

118 tests   111 ✔️  49s ⏱️
    1 suites      7 💤
    1 files        0 ❌

Results for commit 86a521f.

♻️ This comment has been updated with latest results.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

❗ No coverage uploaded for pull request base (master@d39e439). Click here to learn what that means.

Additional details and impacted files

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  Coverage          ?   26.49%           
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  Files             ?       15           
  Lines             ?     2340           
  Branches          ?        0           
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  Hits              ?      620           
  Misses            ?     1720           
  Partials          ?        0           

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