Edge - alarm comment support

Pull Request description

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[x] Description references specific issue.
[x] Description contains human-readable scope of changes.
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[x] Changes are backward compatible or upgrade script is provided.
[x] Similar PR is opened for PE version to simplify merge. Crosslinks between PRs added. Required for internal contributors only.

[x] Added corresponding unit and/or integration test(s). Provide written explanation in the PR description if you have failed to add tests.
[x] If new dependency was added: the dependency tree is checked for conflicts.
[x] If new service was added: the service is marked with corresponding @TbCoreComponent, @TbRuleEngineComponent, @TbTransportComponent, etc.
[x] If new REST API was added: the RestClient.java was updated, issue for Python REST client is created.
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