DataChannels: allow for closing, apply negotiated stream parameters

[codecov[bot]]

Codecov Report

Attention: Patch coverage is 70.21277% with 14 lines in your changes missing coverage. Please review.

Project coverage is 87.58%. Comparing base (637f2d7) to head (b6734af). Report is 1 commits behind head on master.

Files	Patch %	Lines
lib/ex_webrtc/sctp_transport.ex	65.00%	14 Missing :warning:

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #161 +/- ## ========================================== - Coverage 87.82% 87.58% -0.24% ========================================== Files 40 40 Lines 2160 2199 +39 ========================================== + Hits 1897 1926 +29 - Misses 263 273 +10 ``` | [Files](https://app.codecov.io/gh/elixir-webrtc/ex_webrtc/pull/161?dropdown=coverage&src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=elixir-webrtc) | Coverage Δ | | |---|---|---| | [lib/ex\_webrtc/peer\_connection.ex](https://app.codecov.io/gh/elixir-webrtc/ex_webrtc/pull/161?src=pr&el=tree&filepath=lib%2Fex_webrtc%2Fpeer_connection.ex&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=elixir-webrtc#diff-bGliL2V4X3dlYnJ0Yy9wZWVyX2Nvbm5lY3Rpb24uZXg=) | `85.84% <100.00%> (+0.14%)` | :arrow_up: | | [lib/ex\_webrtc/sctp\_transport.ex](https://app.codecov.io/gh/elixir-webrtc/ex_webrtc/pull/161?src=pr&el=tree&filepath=lib%2Fex_webrtc%2Fsctp_transport.ex&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=elixir-webrtc#diff-bGliL2V4X3dlYnJ0Yy9zY3RwX3RyYW5zcG9ydC5leA==) | `81.25% <65.00%> (-3.58%)` | :arrow_down: | ... and [1 file with indirect coverage changes](https://app.codecov.io/gh/elixir-webrtc/ex_webrtc/pull/161/indirect-changes?src=pr&el=tree-more&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=elixir-webrtc) ------ [Continue to review full report in Codecov by Sentry](https://app.codecov.io/gh/elixir-webrtc/ex_webrtc/pull/161?dropdown=coverage&src=pr&el=continue&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=elixir-webrtc). > **Legend** - [Click here to learn more](https://docs.codecov.io/docs/codecov-delta?utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=elixir-webrtc) > `Δ = absolute (impact)`, `ø = not affected`, `? = missing data` > Powered by [Codecov](https://app.codecov.io/gh/elixir-webrtc/ex_webrtc/pull/161?dropdown=coverage&src=pr&el=footer&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=elixir-webrtc). Last update [637f2d7...b6734af](https://app.codecov.io/gh/elixir-webrtc/ex_webrtc/pull/161?dropdown=coverage&src=pr&el=lastupdated&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=elixir-webrtc). Read the [comment docs](https://docs.codecov.io/docs/pull-request-comments?utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=elixir-webrtc).