feat(neotest): add watch keybindings

[cristobalgvera]

📑 Description

Add mappings to simplify the usage of watch-related commands when using neotest.

It also refactor the keybindings to follow current standards using an opts function instead of a table.

ℹ Additional Information

The API for the usage of neotest.watch.stop() is not well defined in terms of the type information for the usage.

This creates the necessity to use @diagnostic disable-next-line: missing-parameter.

For a closer look, see https://github.com/nvim-neotest/neotest/blob/master/doc/neotest.txt#L626

[github-actions]

Review Checklist

Does this PR follow the [Contribution Guidelines](development guidelines)? Following is a partial checklist:

Proper conventional commit scoping:

• If you are adding a new plugin, the scope would be the name of the category it is being added into. ex. feat(utility): added noice.nvim plugin

• If you are modifying a pre-existing plugin or pack, the scope would be the name of the plugin folder. ex. fix(noice-nvim): fix LSP handler error

• Pull request title has the appropriate conventional commit type and scope where the scope is the name of the pre-existing directory in the project as described above

• README is properly formatted and uses fenced in links with <url> unless they are inside a [title](url)

• Entry returns a single plugin spec with the new plugin as the only top level spec (not applicable for recipes or packs).

• Proper usage of opts table rather than setting things up with the config function.

• Proper usage of specs table for all specs that are not dependencies of a given plugin (not applicable for recipes or packs).

[cristobalgvera]

I'm thinking to refactor this after the PR approval, in order to follow the standard process to map keybingings used in here

[Uzaaft]

I'm thinking to refactor this after the PR approval, in order to follow the standard process to map keybingings used in here

Refactor first please. :)