feat: add filtering by symbol(s) to lsp_{document,workspace}_symbols (#903)

lua/telescope/builtin/lsp.lua

@@ -107,6 +107,12 @@ lsp.document_symbols = function(opts)
     vim.list_extend(locations, vim.lsp.util.symbols_to_items(server_results.result, 0) or {})
   end
 
+  locations = utils.filter_symbols(locations, opts)
+  if locations == nil then
+    -- error message already printed in `utils.filter_symbols`
+    return
+  end
+
   if vim.tbl_isempty(locations) then
     return
   end
@@ -263,6 +269,12 @@ lsp.workspace_symbols = function(opts)
     end
   end
 
+  locations = utils.filter_symbols(locations, opts)
+  if locations == nil then
+    -- error message already printed in `utils.filter_symbols`
+    return
+  end
+
   if vim.tbl_isempty(locations) then
     print("No results from workspace/symbol. Maybe try a different query: " ..
       "Telescope lsp_workspace_symbols query=example")