Add metadata to namespaces

[jorgemarey]

This PR adds a metadata field to the namespace objects allowing users to attach custom data to namespaces.

Fixes #9631

[jrasell]

Hi @jorgemarey and thanks for raising this PR. We will try and get an initial review done promptly to provide any feedback.

[schmichael]

Thanks for the PR @jorgemarey! I updated some more docs and the CLI output.

Mind giving it one last look @jrasell?

[jrasell]

Hi @jorgemarey and thanks again, this looks great!

I wonder if it would be possible to add or modify a namespace test to ensure the meta field is present as expected? /nomad/namespace_endpoint_test.go or /command/agent/namespace_endpoint_test.go perhaps?

If you could add a changelog entry that would be wonderful, this document details the process.

[jorgemarey]

Hi @jrasell I added a meta value to the mock namespace. Is that enought? I also created the changelog file.

[jrasell]

Hi @jrasell I added a meta value to the mock namespace. Is that enought? I also created the changelog file.

Yeah that is a great idea.

[jrasell]

LGTM, thanks @jorgemarey!

[schmichael]

Thanks @jrasell and @jorgemarey!

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