Add -c help WIP

[mike0sv]

I was investigating how we can add help to -c options. I was able to do this (but in a bit nasty way)
You can check it out with mlem declare2 env docker --help. Should work with other mlem declare2 commands.
I didnt add field types, defaults and support for complex/nested objects yet
cc @aguschin @jorgeorpinel @omesser

close #214
close #233
close #351

[jorgeorpinel]

I guess this is related to #233 ? If so cc @dberenbaum

I'm not sure I'm getting this mlem declare2 syntax TBH. Maybe a bit more explanation or quick demo in the PR description?

[mike0sv]

Some examples:
mlem declare --help

mlem declare env --help

mlem declare env docker --help

[mike0sv]

Now it looks like this

[mike0sv]

Made less dirty and added for other commands

This breaks backward compatibility for some of them because of rearranged arguments (mlem serve model type -> mlem serve type model)
Also we'll need to fill all docstrings for classes and their fields
Also #351 is still an issue as well as this: some models has __root__ field and we need to handle this

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[jorgeorpinel]

Suggestions and comments/ questions on about half of the files changed (other than tests). Please use what you need and generalize to the rest if possible 🙂

[mike0sv]

@jorgeorpinel we kinda need to merge this to unblock other PRs, I will address your feedback in a separate PR though

[jorgeorpinel]

need to merge this to unblock other PRs

Sure! Didn't mean to block. I noticed the PR was approved but sometimes there's still other feedback that can def. wait or be rejected. Up to you!