Refactor and add `num_nodes` and `verbose` options to `get_top_moves()`

[knutole]

This PR combines and replaces https://github.com/py-stockfish/stockfish/pull/14 and https://github.com/py-stockfish/stockfish/pull/15 , with major refactor of get_top_moves() function. (It was much easier to combine the PR's, for obvious reasons.) I have left in quite a few comments in the refactor, to make it easier to follow. I will remove most of them once you've had a chance to look it over.

• Refactor get_top_moves(), remove redundant code
• Add support for 'num_nodes', see #14
• Add support for 'verbose', see #15
• Add tests for new arguments
• Rename 'N/s' to 'NodesPerSecond'
• Add turn_perspective global option, defaults to Turn perspective. (Note: this means that get_top_moves() will change from returning White perspective to returning Turn perspective by default, which is not backwards compatible. See https://github.com/py-stockfish/stockfish/issues/18)
• Add get/set for self._turn_perspective
• Add get/set for self._num_nodes
• Add self._depth as int and add public getter get_depth(). Fixes https://github.com/py-stockfish/stockfish/issues/8
• Add type checks for set_depth(), set_num_nodes(), set_turn_perspective()
• Add more tests for instantiating Stockfish class
• Add test for _set_option(). Remove redundant default update_parameters_attribute arguments.
• Add convenience method _pick() to avoid doing current_line[current_line.index("cp") + 1]

Todo: Add turn_perspective option for rest of codebase, see https://github.com/py-stockfish/stockfish/issues/18

[github-actions[bot]]

Coverage report

The coverage rate went from 93.35% to 94.78% :arrow_up: The branch rate is 88%.

96.72% of new lines are covered.

Diff Coverage details (click to unfold)

### stockfish/models.py `96.72%` of new lines are covered (`94.78%` of the complete file). Missing lines: `660`, `664`

[kieferro]

Wow, that's quite a PR. First of all, a big thank you for the work and the interest that you put in this project! I am currently not able to test and review your code, but it looks like you're still at work anyway. So just ping us or request if you need a review.

[knutole]

Thank you 🙏 This PR is now ready for review 👌

[knutole]

It's not possible for me to request review on this PR, by the way, not sure if there's a Github setting for that. @kieferro @johndoknjas

[kieferro]

It's not possible for me to request review on this PR, by the way, not sure if there's a Github setting for that. @kieferro @johndoknjas

Ah okay, I see. But it seems that nothing can be done about that as long as you don't have write-access. But feel free to just use the draft PR feature to indicate when the PR is ready for review.

[johndoknjas]

Looks like we're all satisfied with the PR, so I've merged it into master.

[knutole]

Great, thanks 🙏👍

[kieferro]

Looks like we're all satisfied with the PR, so I've merged it into master.

Thanks :+1:

Congratulations @knutole. Could you close your two PRs in the old repo (https://github.com/zhelyabuzhsky/stockfish/pull/115, https://github.com/zhelyabuzhsky/stockfish/pull/116)? This would give us a better overview.