Added SCTPTransport.BufferedAmount

[sirzooro]

It simplifies tracking amount of unsent data for all data channels, including ones in closing state. Especially useful for IoT apps which use multiple data channels and have to monitor memory usage.

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 7 lines in your changes missing coverage. Please review.

Project coverage is 78.76%. Comparing base (3e43ae9) to head (9c5f589).
Report is 1 commits behind head on master.

Files with missing lines	Patch %	Lines
sctptransport.go	0.00%	7 Missing ⚠️

❌ Your patch status has failed because the patch coverage (0.00%) is below the target coverage (70.00%). You can increase the patch coverage or adjust the target coverage.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #3096      +/-   ##
==========================================
+ Coverage   78.67%   78.76%   +0.09%     
==========================================
  Files          91       91              
  Lines       11340    11347       +7     
==========================================
+ Hits         8922     8938      +16     
+ Misses       1929     1924       -5     
+ Partials      489      485       -4     

Flag	Coverage Δ
go	80.67% <0.00%> (+0.09%)	⬆️
wasm	63.84% <ø> (ø)

Flags with carried forward coverage won't be shown. Click here to find out more.

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.

🚀 New features to boost your workflow:

• ❄️ Test Analytics: Detect flaky tests, report on failures, and find test suite problems.
• 📦 JS Bundle Analysis: Save yourself from yourself by tracking and limiting bundle sizes in JS merges.