Avoid SRTP/SRTCP state creation before auth

[JoTurk]

Description

one of the many security issues reported by @sirzooro

[codecov]

Codecov Report

❌ Patch coverage is 90.90909% with 3 lines in your changes missing coverage. Please review.
✅ Project coverage is 82.72%. Comparing base (51804b0) to head (7c64570).

Files with missing lines	Patch %	Lines
session_srtp.go	70.00%	1 Missing and 2 partials ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #373      +/-   ##
==========================================
+ Coverage   82.42%   82.72%   +0.30%     
==========================================
  Files          19       19              
  Lines        1462     1482      +20     
==========================================
+ Hits         1205     1226      +21     
  Misses        142      142              
+ Partials      115      114       -1     

Flag	Coverage Δ
go	82.72% <90.90%> (+0.30%)	⬆️

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

☔ View full report in Codecov by Harness.
📢 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.

[JoTurk]

This new nolint is unfortunate but I didn't want to add noise in a security fix, so I'll refactor this function and will remove the nolint after this is merged

[sirzooro]

I think it addressed the same issue as my PR #372 ?

[JoTurk]

@sirzooro Sorry I was sick this weekend and i forgot that you made a PR to fix a few things including this issue, I see that the most important issues in the file you sent me are already fixed.
I'll try to review your PR tonight or tomorrow.