refactor(toggleterm)!: simplified keybinds with removed abstraction

[opalmay]

1. Users can now add keybinds more easily to lvim.builtin.terminal.terminals
   eg:

local terminals = {
  { keymap = "<leader>u", cmd = "sudo dmesg | less", desc = "Show Kernel Logs", size = 1 },
  { keymap = "<leader>h", cmd = "htop", desc = "Interactive System Monitor", size = 0.8 },
  {
    keymap = "<leader>os",
    direction = "vertical",
    cmd = "docker ps",
    desc = "List Docker Containers",
    close_on_exit = false,
    persist_mode = false,
    size = 0.3,
  },
  { keymap = "<M-4>", cmd = "neofetch", close_on_exit = false, direction = "horizontal", size = 0.6 },
}
vim.list_extend(lvim.builtin.terminal.terminals, terminals)

2. lvim.builtin.terminal.terminals_defaults is a table containing defaults for direction, horizontal_size, vertical_size that can be modified by the user.
3. lvim.builtin.terminal.execs is handled with soft deprecation and link to the docs docs: terminal keybinds lunarvim.org#367
4. There's no abstraction, all parameters are passed as is to toggleterm:new directly. One exception is size which is calculated as a percentage of the buffer size in the terminal direction (same as it was) and size = 1 being a special case for a full screen terminal (like lazygit). desc is being used for the keybind description, can be explicitly provided, otherwise it is based on the keybind cmd.
5. Refactored lazygit to use this instead of a custom function.
6. Changed lvim.builtin.terminal from bracket to dot notation for intellisense.

Depends on #3811

[opalmay]

@LostNeophyte How do you think we should handle deprecation here?
Probably the easiest would be to call this something different than execs, so it can be addressed in _deprecated.lua by the old table name

[kylo252]

I'm not sure we want to add a breaking change to tweak this wrapper, as we mostly use this table as only to alter some common defaults.

At the very least, we can soft-deprecate the original table without doing a breaking change.

Alternatively, we can leave this as is, and suggest using the full API from toggle-term instead.

[kylo252]

this needs to be a callback

Suggested change

	term_opts.size = get_dynamic_terminal_size(term_opts.direction, term_opts.size)
	term_opts.size = function()
	get_dynamic_terminal_size(term_opts.direction, term_opts.size)
	end

[opalmay]

Are you sure? It doesn't work and it works without a callback

[kylo252]

@opalmay, it should be able to take a function

https://github.com/akinsho/toggleterm.nvim/blob/31d38d11390bcd35a568fcc65a79b7d6ec89de62/lua/toggleterm/ui.lua#L258-L260

check their README for an example

[kylo252]

basically, it won't be dynamically calculated if it's not a function.