Fix SDP parsing for repeat time field with no offsets

[nicoske]

• Fixes SDP parser rejects valid "r=0 0" repeat time field #879
• Fixes SDP parsing to accept r=0 0 syntax (repeat time with no offsets)
• Changes validation from requiring 3 fields minimum to 2 fields minimum - Adds test case for AJA encoder compatibility

According to RFC 4566, the repeat time field r=<interval> <duration> [<offsets>...] allows optional offsets. The fix allows r=0 0 which means "no repeat times".

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 80.92%. Comparing base (a8513af) to head (29021c9).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #880   +/-   ##
=======================================
  Coverage   80.92%   80.92%           
=======================================
  Files         128      128           
  Lines       14323    14323           
=======================================
  Hits        11591    11591           
  Misses       2206     2206           
  Partials      526      526           

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[aler9]

merged, thank you very much!