Release model: Add support for getting/patching releases by `raw_version`s

[myarmolinsky]

Release model: Add support for getting/patching releases by raw_versions

Change-type: minor See: https://balena.zulipchat.com/#narrow/stream/346007-balena-io.2FbalenaCloud/topic/SDK.20raw_version.20support

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Contributor checklist

• [ ] Includes tests
• [ ] Includes typings
• [ ] Includes updated documentation
• [ ] Includes updated build output

[myarmolinsky]

LGTM