[RTC-426] Allow for assigning custom room id

[roznawsk]

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

Merging #133 (041f27c) into main (0a8e8d5) will increase coverage by 0.00%. The diff coverage is 95.23%.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #133 +/- ## ======================================= Coverage 86.90% 86.91% ======================================= Files 59 59 Lines 1054 1062 +8 ======================================= + Hits 916 923 +7 - Misses 138 139 +1 ``` | [Files](https://app.codecov.io/gh/jellyfish-dev/jellyfish/pull/133?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/room.ex](https://app.codecov.io/gh/jellyfish-dev/jellyfish/pull/133?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=jellyfish-dev#diff-bGliL2plbGx5ZmlzaC9yb29tLmV4) | `86.79% <100.00%> (ø)` | | | [lib/jellyfish/room\_service.ex](https://app.codecov.io/gh/jellyfish-dev/jellyfish/pull/133?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=jellyfish-dev#diff-bGliL2plbGx5ZmlzaC9yb29tX3NlcnZpY2UuZXg=) | `84.84% <100.00%> (+0.23%)` | :arrow_up: | | [lib/jellyfish\_web/api\_spec/room.ex](https://app.codecov.io/gh/jellyfish-dev/jellyfish/pull/133?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=jellyfish-dev#diff-bGliL2plbGx5ZmlzaF93ZWIvYXBpX3NwZWMvcm9vbS5leA==) | `100.00% <ø> (ø)` | | | [lib/jellyfish\_web/controllers/room\_controller.ex](https://app.codecov.io/gh/jellyfish-dev/jellyfish/pull/133?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=jellyfish-dev#diff-bGliL2plbGx5ZmlzaF93ZWIvY29udHJvbGxlcnMvcm9vbV9jb250cm9sbGVyLmV4) | `100.00% <100.00%> (ø)` | | | [lib/jellyfish/room/config.ex](https://app.codecov.io/gh/jellyfish-dev/jellyfish/pull/133?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=jellyfish-dev#diff-bGliL2plbGx5ZmlzaC9yb29tL2NvbmZpZy5leA==) | `90.90% <83.33%> (-3.21%)` | :arrow_down: | ------ [Continue to review full report in Codecov by Sentry](https://app.codecov.io/gh/jellyfish-dev/jellyfish/pull/133?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/133?src=pr&el=footer&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=jellyfish-dev). Last update [0a8e8d5...041f27c](https://app.codecov.io/gh/jellyfish-dev/jellyfish/pull/133?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).