FE: Messages: impl message reproduce

[benaskiburtas]

• Breaking change? (if so, please describe the impact and migration path for existing application instances)

What changes did you make? (Give an overview)

Resolves #247
Added a new action to the message action dropdown as suggested on #247:

This is implemented via a hook useProduceMessage and TopicActionsContext to interact with the side-bar while avoiding prop drilling.

Action will prefill:

• Partition
• Key
• Message content
• Headers
• Key Serde (currently selected)
• Value Serde (currently selected)

SendMessage.tsx had some aria labels misconfigured, adjusted some properties slightly to point to actual labels.

Is there anything you'd like reviewers to focus on?

• For the moment I linked this action to the same ResourceType.TOPIC & Action.MESSAGES_PRODUCE permissions, same as the existing standalone action. The initial issue description suggested a new permission specifically for reproducing a message (e.g. Action.MESSAGES_REPRODUCE?). Do let me know if that would be preferred; :)
• I slightly struggled manually verifying RBAC roles are working correctly. Covered this case with a test but wouldn't hurt to double check;
• Frontend isn't my strong suit, may have over-engineered with the new context component. Thought it could be used to add some more 'global' functionality later on. Do let me know if passing some props around more directly would be better;
• It's my first PR to this project, any feedback is welcome and appreciated 💜

How Has This Been Tested? (put an "x" (case-sensitive!) next to an item)

• No need to
• Manually (please, describe, if necessary)
• Unit checks
• Integration checks
• Covered by existing automation

Checklist (put an "x" (case-sensitive!) next to all the items, otherwise the build will fail)

• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation (e.g. ENVIRONMENT VARIABLES)
• My changes generate no new warnings (e.g. Sonar is happy)
• I have added tests that prove my fix is effective or that my feature works
• New and existing unit tests pass locally with my changes
• Any dependent changes have been merged

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