Allow specifying file name and format as cmd args for freeze, deduce format from filename

[dnaaun]

First off, thanks for this Python solution to tmux session management! Works quite well.

tmuxp freeze does a lot of prompting, but I wanted the option to not be prompted sometimes (for example, I want to setup a binding in tmux that saves the current session in the current directory, and I don't want to be prompted for file name / file format).

So this commit adds the following:

1. The -o / --save-to option. If the user doesn't provide it, we will prompt.
2. The -f / --config-format option. If the user doesn't provide it, we'll try to deduce it from the extension of the file specified by the --save-to option. If that doesn't give a valid format, we prompt the user.
3. The -y / --yes option. In addition to the prompts for the above two, we currently prompt for cofnrimation/warning two additional times when doing freeze. Specifying this -y flag avoids that.
4. The -q / --quiet option reduces some informative output. This is mostly a personal preference. I like my command line tools to be as quiet as possible.

I haven't touched the tests here. I wanted to confirm that there was interest from the maintainers first.

A good demonstration of what the above changes enable is the following tmux mapping:

bind -T root C-s run-shell "tmuxp freeze -yqo .tmuxp.yaml"

This silently saves the current session in the current working directory of tmux after pressing Ctrl-S.

[tony]

@davidatbu Thank you!

I'm wondering why tests aren't showing up in GH actions. Can you try rebasing?

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[tony]

@davidatbu Here is another ping, can you try giving this a rebase please?

[tony]

test_cli.py issues to iron out, it seems

[tony]

@davidatbu Sorry about this! This is extremely difficult to handle without a rebase, I don't have force push access to do it myself

I'd like you to get credit for the pull request being merged here but i may have to make a separate PR with this change.

[tony]

! This is extremely difficult to handle without a rebase, I don't have force push access to do it myself

I apparently do! Nice!

[codecov]

Codecov Report

Merging #701 (0322895) into master (d2c1b56) will increase coverage by 0.05%.
The diff coverage is 73.52%.

@@            Coverage Diff             @@
##           master     #701      +/-   ##
==========================================
+ Coverage   75.91%   75.96%   +0.05%     
==========================================
  Files           7        7              
  Lines        1179     1190      +11     
  Branches      306      311       +5     
==========================================
+ Hits          895      904       +9     
+ Misses        201      199       -2     
- Partials       83       87       +4     

Impacted Files	Coverage Δ
tmuxp/cli.py	73.51% <73.52%> (+0.19%)	⬆️

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