treewide: implement lazy loading via lz.n for selected plugins (#407)

* flake: add lz.n and lzn-auto-require

* lazy: init module

* lzn-auto-require: add init lua code

* wrapper: fix opt plugin format

* lib.binds: add lz.n variant of bind functions

* telescope: lazy load

* nvim-tree: lazy load

* dapui: lazy load

* trouble: lazy load

* toggleterm: lazy load

* cheatsheet: lazy load

* diffview: lazy load

* icon-picker: lazy load

* leap: lazy load

* fidget: lazy load

* docs: add section on lazy plugins

* lazy: support lazy.enable=false

* comment-nvim: lazy load

* surround-nvim: lazy load

* neo-tree: lazy load

* fixup! lazy: init module

* dap: appease the nix gods (fix statix lint)

* flake.lock: fix merge mistake

* doc: update release note

* fixup! doc: update release note

* neo-tree: fix duplicate neo-tree install

* lazy: use attrsOf for lazy.plugins

* treewide: update lazy.plugins syntax

* docs: update lazy.plugins syntax

* lazy: cleanup

* Update docs/manual/hacking/additional-plugins.md

Co-authored-by: diniamo <55629891+diniamo@users.noreply.github.com>

* formatting nitpick

Co-authored-by: diniamo <55629891+diniamo@users.noreply.github.com>

* typo tee hee :3

Co-authored-by: diniamo <55629891+diniamo@users.noreply.github.com>

* typo tee hee :4

Co-authored-by: diniamo <55629891+diniamo@users.noreply.github.com>

* flake: update lz.n

* lazy: update lz.n plugin spec

* lazy: allow lines in place of str for lua code

* copilot: lazy load

* cmp: lazy load

this moves cmp itself to lazy.plugins but other plugins that call cmp
are not yet lazy so cmp is technically not yet lazy

* luasnip: lazy load

* flake: add rtp.nvim

* cmp: actually lazy load source

* fixup! cmp: actually lazy load source

* format

* docs: fix broken link

* cmp-nvim-lsp: lazy load

* lazy: allow key mode of str type

* cmp: install sourcess via cmp.sourcePlugins

* Update docs/manual/hacking/additional-plugins.md

Co-authored-by: diniamo <55629891+diniamo@users.noreply.github.com>

* lazy: refactor common var

* nvim-dap-ui: add setupOpts

* refactor: re-order plugin and lz.n configs

lazy: make lzn-auto-require togglable

* docs: update dag-entries

* trouble: remove redundant import

* lazy: remove unused module arg

* toggleterm: make lazygit keybind optional

* toggleterm: use toLuaObject for clarity

* surround: rework keymap config

* remove stale FIXME

* lsp: use cmp_nvim_lsp capabilities

* cmp: deduplicate attr key

* theme: ensure themes load before lazy plugins

* doc: update description of `theme` dag entry

* lsp: avoid loading cmp on startup

* doc: update configuration docs on custom plugins

* cmp: skip trigger_load if lazy disabled

* treesitter: remove redundant code

* lsp: mark hack as HACK

* comment: remove redundant plugin

* Squash merge v0.7 into feature/lzn

---------

Co-authored-by: raf <raf@notashelf.dev>
Co-authored-by: diniamo <55629891+diniamo@users.noreply.github.com>

docs/manual/hacking/additional-plugins.md

@@ -124,3 +124,61 @@ vim.your-plugin.setupOpts = {
   '';
 }
 ```
+
+## Lazy plugins {#sec-lazy-plugins}
+
+If the plugin can be lazy-loaded, `vim.lazy.plugins` should be used to add it. Lazy
+plugins are managed by `lz.n`.
+
+```nix
+# in modules/.../your-plugin/config.nix
+{lib, config, ...}:
+let
+  cfg = config.vim.your-plugin;
+in {
+  vim.lazy.plugins.your-plugin = {
+    # instead of vim.startPlugins, use this:
+    package = "your-plugin";
+
+    # if your plugin uses the `require('your-plugin').setup{...}` pattern
+    setupModule = "your-plugin";
+    inherit (cfg) setupOpts;
+
+    # events that trigger this plugin to be loaded
+    event = ["DirChanged"];
+    cmd = ["YourPluginCommand"];
+
+    # keymaps
+    keys = [
+      # we'll cover this in detail in the keymaps section
+      {
+        key = "<leader>d";
+        mode = "n";
+        action = ":YourPluginCommand";
+      }
+    ];
+  };
+;
+}
+```
+
+This results in the following lua code:
+```lua
+require('lz.n').load({
+  {
+    "name-of-your-plugin",
+    after = function()
+      require('your-plugin').setup({--[[ your setupOpts ]]})
+    end,
+
+    event = {"DirChanged"},
+    cmd = {"YourPluginCommand"},
+    keys = {
+      {"<leader>d", ":YourPluginCommand", mode = {"n"}},
+    },
+  }
+})
+```
+
+A full list of options can be found
+[here](https://notashelf.github.io/nvf/options.html#opt-vim.lazy.plugins