(https://github.com/ruby/irb/pull/708)

* Add completor using prism and rbs

* Add TypeCompletion test

* Switchable completors: RegexpCompletor and TypeCompletion::Completor

* Add completion info to irb_info

* Complete reserved words

* Fix [*] (*) {**} and prism's change of KeywordParameterNode

* Fix require, frozen_string_literal

* Drop prism<=0.16.0 support

* Add Completor.last_completion_error for debug report

* Retrieve `self` and `Module.nesting` in more safe way

* Support BasicObject

* Handle lvar and ivar get exception correctly

* Skip ivar reference test of non-self object in ruby < 3.2

* BaseScope to RootScope, move method objects constant under Methods

* Remove unused Splat struct

* Drop deeply nested array/hash type calculation from actual object. Now, calculation depth is 1

* Refactor loading rbs in test, change preload_in_thread not to cache Thread object

* Use new option added in prism 0.17.1 to parse code with localvars

* Add Prism version check and warn when :type completor cannot be enabled

* build_type_completor should skip truffleruby (because endless method definition is not supported)

https://github.com/ruby/irb/commit/1048c7ed7a