fix(bufferline-nvim): add back bufferline leader bindings

[acarl005]

📑 Description

Since this import uses astrocommunity.recipes.disable-tabline, it disables all the <leader>b bindings too. This PR adds back the bufferline equivalents of those bindings.

Basically a continuation of #1009.

NOTE: I wasn't able to easily find an equivalent of <leader>bC to close all buffers.

ℹ Additional Information

This takes all the default bindings from the docs with the exception of <leader>bC.

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