feat(nvim-coverage): add keybindings

[cristobalgvera]

📑 Description

Add mappings to nvim-coverage.

Also, it was added the option to reload the coverage report if it changes, a useful option complemented with the ease to show the coverage added with the mappings.

ℹ Additional Information

The mapping was added as a second layer behind Tests map. This is because neotest and vim-test use the <Leader>T map and name it like that, allowing to complement the usage of those plugins without depending on it.

[github-actions[bot]]

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

• [x] 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

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

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

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

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

[Uzaaft]

Ah now I see the other usage of test_prefix. My bad. 2s