feat: add Maintainers Growth Working Group

[smoya]

Description

This PR materializes the creation of the Maintainers Growth Working Group, as discussed in https://github.com/orgs/asyncapi/discussions/1094.

It replaces #1090.

Additionally, it introduces a new format on the WORKING_GROUPS.yaml file so we can expand metadata about members, such as slack user id, etc as per https://github.com/asyncapi/community/pull/1090/files#r1537111382.

[smoya]

Added myself, but I still believe @fmvilas should be the one. Discussion happening in https://github.com/orgs/asyncapi/discussions/1094#discussioncomment-9132744.

But we can move forward and merge this, we can change later if applies.

[smoya]

@alequetzalli @derberg @thulieblack @fmvilas @Mayaleeeee @AceTheCreator this PR is now ready to review!

[smoya]

/help

[asyncapi-bot]

Hello, @smoya! 👋🏼

    I'm 🧞🧞🧞 Genie 🧞🧞🧞 from the magic lamp. Looks like somebody needs a hand!

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[smoya]

/ptal

[asyncapi-bot]

Please take a look at this PR. Thanks! 👋

[smoya]

@alequetzalli 👋

[quetzalliwrites]

done!

[smoya]

/ptal

[asyncapi-bot]

@thulieblack Please take a look at this PR. Thanks! 👋

[thulieblack]

🫡

[smoya]

@fmvilas can you approve? You requested changes that were applied.

[smoya]

/rtm