plugins: use new config-aware mkMappingOption

Generated using:

- `sd -F "inherit (lib.nvim.binds) mkMappingOption;" "inherit (config.vim.lib) mkMappingOption;" $(find . -type f)`
- `sd -F "{lib, ...}: let" "{config, lib, ...}: let" $(find . -type f)`

Tweaked manually (placement in inherit list, fixing todo-comments and toggleterm).

Ran `nix run nixpkgs#deadnix -- -e` to clean up.
Next commit includes unrelated dead code.

modules/plugins/completion/blink-cmp/blink-cmp.nix

@@ -1,9 +1,13 @@
-{lib, ...}: let
+{
+  config,
+  lib,
+  ...
+}: let
   inherit (lib.options) mkEnableOption mkOption literalMD;
   inherit (lib.types) bool listOf str either attrsOf submodule enum anything int nullOr;
   inherit (lib.nvim.types) mkPluginSetupOption luaInline pluginType;
-  inherit (lib.nvim.binds) mkMappingOption;
   inherit (lib.nvim.config) mkBool;
+  inherit (config.vim.lib) mkMappingOption;
 
   keymapType = submodule {
     freeformType = attrsOf (listOf (either str luaInline));

modules/plugins/completion/nvim-cmp/nvim-cmp.nix

@@ -6,9 +6,9 @@
   inherit (lib.options) mkEnableOption mkOption literalMD;
   inherit (lib.types) str attrsOf nullOr either listOf;
   inherit (lib.generators) mkLuaInline;
-  inherit (lib.nvim.binds) mkMappingOption;
   inherit (lib.nvim.types) mkPluginSetupOption luaInline mergelessListOf pluginType;
   inherit (lib.nvim.lua) toLuaObject;
+  inherit (config.vim.lib) mkMappingOption;
   inherit (builtins) isString;
 
   cfg = config.vim.autocomplete.nvim-cmp;