Migration to Teal with GitLab Support

[l0nax]

Issue Description

Type: "feature request"

Describe what happened (or what feature you want)

Since I really love this plugin but mostly work with GitLab, I decided to start the migration to Teal allowing us to easily implement gitlab (or any other Host provider).

See #138

Since the code base is not small anymore, I did not migrate the whole project to Teal, instead, only the parts which are relevant for the implementation are migrated/ refactored.

Currently, only GitLab issues are implemented.

[pwntester]

Hi @l0nax thanks for the PR. Can you elaborate on why gitlab provider cannot be supported in plain lua? Im ok adding support for GitLab or other providers but Im not considering migrating @

[brendalf]

Hello there. I agree with @pwntester, the gitlab support should use the glab tool as backend, which is a non official gitlab cli, akin to gh cli.
In fairness, I started looking at this because I use gitlab in my company and Octo is awesome.
I'd love to work in that integration, WDYT @pwntester?
Can I open a MR with some raw work to kick off some discussions?

[pwntester]

Sure, that sounds great!

[sunzoje]

Glab is now officially adopted by GitLab. profclems/glab#983

[brendalf]

Hi there. Sorry for taking so long. I will open the MR this weekend.

[l0nax]

@sunzoje I already converted roughly about 70% of the code base to lua. I will push the changes this weekend.

[Daemoen]

Any update on this ?