feat(inlay-hints): add inlay hints toggle function

lua/rust-tools/inlay_hints.lua

@@ -4,7 +4,7 @@ local M = {}
 
 function M.new()
   M.namespace = vim.api.nvim_create_namespace("textDocument/inlayHints")
-  local self = setmetatable({ cache = {}, enabled = false }, { __index = M })
+  local self = setmetatable({ cache = {} }, { __index = M })
 
   return self
 end
@@ -17,6 +17,7 @@ end
 -- Disable hints and clear all cached buffers
 function M.disable(self)
   self.disable = false
+  M.is_enabled = false
   M.disable_cache_autocmd()
 
   for k, _ in pairs(self.cache) do
@@ -34,11 +35,22 @@ end
 
 -- Enable auto hints and set hints for the current buffer
 function M.enable(self)
-  self.enabled = true
+  self.enable = false
+  M.is_enabled = true
   M.enable_cache_autocmd()
   set_all(self)
 end
 
+-- Toggles inlay hints state globally. Uses disable and enable internally
+function M.toggle(self)
+  if self.is_enabled then
+    M.disabled(self)
+  else
+    M.enable(self)
+  end
+  M.is_enabled = not M.is_enabled
+end
+
 -- Set inlay hints only for the current buffer
 function M.set(self)
   M.cache_render(self, 0)