feat(jj): Use float direction with lazyjj and jjui terminals

[pgr0ss]

📑 Description

This lets these tools use a float window instead of a small split at the bottom of the screen, and is how lazygit is currently used in AstroNvim:

https://github.com/AstroNvim/AstroNvim/blob/0001b5adbd6b6b9c14166f5c5955c43fde5624de/lua/astronvim/plugins/toggleterm.lua#L18

📖 Additional Information

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After:

[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).