allow image media type and udptl protocol in sdp parser

[codecov[bot]]

Codecov Report

Patch coverage has no change and project coverage change: -0.07% :warning:

Comparison is base (71157ba) 61.56% compared to head (ce7e3c0) 61.49%.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #497 +/- ## ========================================== - Coverage 61.56% 61.49% -0.07% ========================================== Files 529 529 Lines 48839 48839 Branches 12361 12355 -6 ========================================== - Hits 30066 30035 -31 - Misses 9601 9620 +19 - Partials 9172 9184 +12 ``` | [Files Changed](https://app.codecov.io/gh/webrtc-rs/webrtc/pull/497?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=webrtc-rs) | Coverage Δ | | |---|---|---| | [sdp/src/description/session.rs](https://app.codecov.io/gh/webrtc-rs/webrtc/pull/497?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=webrtc-rs#diff-c2RwL3NyYy9kZXNjcmlwdGlvbi9zZXNzaW9uLnJz) | `63.84% <ø> (-0.46%)` | :arrow_down: | ... and [19 files with indirect coverage changes](https://app.codecov.io/gh/webrtc-rs/webrtc/pull/497/indirect-changes?src=pr&el=tree-more&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=webrtc-rs)

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