[RTC-436] Propagate websocket close reason

[roznawsk]

Added websocket closing reason, which is from now accessible from the fronted.

Acknowledging the stipulations set forth:

• [ x ] I hereby confirm that a Pull Request involving updates to the Software Development Kit (SDK) has been smoothly merged, currently awaits processing, or is otherwise deemed unnecessary in this context.
• [ x ] I also affirm that another Pull Request, specifically addressing updates to the documentation body (commonly referred to as 'docs'), has either been successfully incorporated, is in the process of review, or is considered superfluous under the prevailing circumstances.

[codecov[bot]]

Codecov Report

:exclamation: No coverage uploaded for pull request base (main@fe17b8c). Click here to learn what that means. The diff coverage is 75.00%.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #140 +/- ## ======================================= Coverage ? 87.32% ======================================= Files ? 59 Lines ? 1097 Branches ? 0 ======================================= Hits ? 958 Misses ? 139 Partials ? 0 ``` | [Files](https://app.codecov.io/gh/jellyfish-dev/jellyfish/pull/140?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=jellyfish-dev) | Coverage Δ | | |---|---|---| | [lib/jellyfish\_web/peer\_socket.ex](https://app.codecov.io/gh/jellyfish-dev/jellyfish/pull/140?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=jellyfish-dev#diff-bGliL2plbGx5ZmlzaF93ZWIvcGVlcl9zb2NrZXQuZXg=) | `86.04% <75.00%> (ø)` | | ------ [Continue to review full report in Codecov by Sentry](https://app.codecov.io/gh/jellyfish-dev/jellyfish/pull/140?src=pr&el=continue&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=jellyfish-dev). > **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=jellyfish-dev) > `Δ = absolute (impact)`, `ø = not affected`, `? = missing data` > Powered by [Codecov](https://app.codecov.io/gh/jellyfish-dev/jellyfish/pull/140?src=pr&el=footer&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=jellyfish-dev). Last update [fe17b8c...8765ade](https://app.codecov.io/gh/jellyfish-dev/jellyfish/pull/140?src=pr&el=lastupdated&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=jellyfish-dev). 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=jellyfish-dev).