Extend Engine.terminate API

[codecov[bot]]

Codecov Report

Merging #337 (f51c700) into master (361ab58) will not change coverage. The diff coverage is 100.00%.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #337 +/- ## ======================================= Coverage 54.37% 54.37% ======================================= Files 41 41 Lines 2082 2082 ======================================= Hits 1132 1132 Misses 950 950 ``` | [Files](https://app.codecov.io/gh/jellyfish-dev/membrane_rtc_engine/pull/337?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=jellyfish-dev) | Coverage Δ | | |---|---|---| | [engine/lib/membrane\_rtc\_engine/engine.ex](https://app.codecov.io/gh/jellyfish-dev/membrane_rtc_engine/pull/337?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=jellyfish-dev#diff-ZW5naW5lL2xpYi9tZW1icmFuZV9ydGNfZW5naW5lL2VuZ2luZS5leA==) | `81.36% <100.00%> (ø)` | | ... and [2 files with indirect coverage changes](https://app.codecov.io/gh/jellyfish-dev/membrane_rtc_engine/pull/337/indirect-changes?src=pr&el=tree-more&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=jellyfish-dev) ------ [Continue to review full report in Codecov by Sentry](https://app.codecov.io/gh/jellyfish-dev/membrane_rtc_engine/pull/337?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/membrane_rtc_engine/pull/337?src=pr&el=footer&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=jellyfish-dev). Last update [361ab58...f51c700](https://app.codecov.io/gh/jellyfish-dev/membrane_rtc_engine/pull/337?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).