Add SDK Sends API feature flag

[adudek-bw]

🎟️ Tracking

https://bitwarden.atlassian.net/browse/PM-31066

📔 Objective

Adds feature flag for implementing Sends API in the SDK

📸 Screenshots

[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud

[github-actions]

Checkmarx One – Scan Summary & Details – bd6f8303-9c99-41a8-b1f6-ab5367ff7ce2

Great job! No new security vulnerabilities introduced in this pull request

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 57.69%. Comparing base (2efacd5) to head (e574493).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #7254   +/-   ##
=======================================
  Coverage   57.69%   57.69%           
=======================================
  Files        2035     2035           
  Lines       89672    89672           
  Branches     7993     7993           
=======================================
  Hits        51738    51738           
  Misses      36074    36074           
  Partials     1860     1860           

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