Inherit javascript/typescript from common 'ecma' queries (#3301)

JavaScript queries now contain a few lines that prevent them from
being used whole-sale in typescript with `; inherits: javascript`.
Here we follow nvim-treesitter's way of using a fake 'ecma' language
as a common base for JavaScript and TypeScript to share as much as
we can.

runtime/queries/ecma/textobjects.scm

@@ -0,0 +1,36 @@
+(function_declaration
+  body: (_) @function.inside) @function.around
+
+(function
+  body: (_) @function.inside) @function.around
+
+(arrow_function
+  body: (_) @function.inside) @function.around
+
+(method_definition
+  body: (_) @function.inside) @function.around
+
+(generator_function_declaration
+  body: (_) @function.inside) @function.around
+
+(class_declaration
+  body: (class_body) @class.inside) @class.around
+
+(class
+  (class_body) @class.inside) @class.around
+
+(export_statement
+  declaration: [
+    (function_declaration) @function.around
+    (class_declaration) @class.around 
+  ])
+
+(formal_parameters
+  ((_) @parameter.inside . ","? @parameter.around) @parameter.around)
+
+(arguments
+  ((_) @parameter.inside . ","? @parameter.around) @parameter.around)
+
+(comment) @comment.inside
+
+(comment)+ @comment.around