Update bundled RBS files for Ruby 3.1

[soutaro]

There are some changes in method type definitions in Ruby 3.1 and many documentation changes since the RBS files in this repo is generated. So, let's update the RBS files!

We do 💪

1. Update outdated documentations and fix minor problems of types (step 1)
2. Add new methods (step 2)

We don't 🙈

1. Add missing type signatures for classes/modules/methods, especially for stdlibs
2. Fix method types
3. Delete deprecated libraries, or move the RBS files to gem_rbs_collection

Step 1

Builtin classes

• [ ] core/array.rbs
• [ ] core/basic_object.rbs
• [ ] core/binding.rbs
• [ ] core/builtin.rbs
• [ ] core/class.rbs
• [ ] core/comparable.rbs
• [ ] core/complex.rbs
• [ ] core/constants.rbs
• [ ] core/deprecated.rbs
• [ ] core/dir.rbs
• [ ] core/encoding.rbs
• [ ] core/enumerable.rbs
• [ ] core/enumerator.rbs
• [ ] core/env.rbs
• [ ] core/errno.rbs
• [ ] core/errors.rbs
• [ ] core/exception.rbs
• [ ] core/false_class.rbs
• [ ] core/fiber.rbs
• [ ] core/fiber_error.rbs
• [ ] core/file.rbs
• [ ] core/file_test.rbs
• [ ] core/float.rbs
• [ ] core/gc.rbs
• [ ] core/global_variables.rbs
• [ ] core/hash.rbs
• [ ] core/integer.rbs
• [ ] core/io.rbs
• [ ] core/io/wait.rbs
• [ ] core/kernel.rbs
• [ ] core/marshal.rbs
• [ ] core/match_data.rbs
• [ ] core/math.rbs
• [ ] core/method.rbs
• [ ] core/module.rbs
• [ ] core/nil_class.rbs
• [ ] core/numeric.rbs
• [ ] core/object.rbs
• [ ] core/object_space.rbs
• [ ] core/proc.rbs
• [ ] core/process.rbs
• [ ] core/ractor.rbs
• [ ] core/random.rbs
• [ ] core/range.rbs
• [ ] core/rational.rbs
• [ ] core/rb_config.rbs
• [ ] core/regexp.rbs
• [ ] core/ruby_vm.rbs
• [ ] core/signal.rbs
• [ ] core/string.rbs
• [ ] core/string_io.rbs
• [ ] core/struct.rbs
• [ ] core/symbol.rbs
• [ ] core/thread.rbs
• [ ] core/thread_group.rbs
• [ ] core/time.rbs
• [ ] core/trace_point.rbs
• [ ] core/true_class.rbs
• [ ] core/unbound_method.rbs
• [ ] core/warning.rbs

stdlib

• [ ] abbrev/
• [ ] base64/
• [ ] benchmark/
• [ ] bigdecimal/
• [ ] bigdecimal-math/
• [ ] cgi/
• [ ] coverage/
• [ ] csv/
• [ ] date/
• [ ] dbm/
• [ ] digest/
• [ ] erb/
• [ ] fiber/
• [ ] fileutils/
• [ ] find/
• [ ] forwardable/
• [ ] io-console/
• [ ] ipaddr/
• [ ] json/
• [ ] logger/
• [ ] monitor/
• [ ] mutex_m/
• [ ] net-http/
• [ ] objspace/
• [ ] openssl/
• [ ] optparse/
• [ ] pathname/
• [ ] prettyprint/
• [ ] prime/
• [ ] pstore/
• [ ] pty/
• [ ] resolv/
• [ ] rubygems/
• [ ] securerandom/
• [ ] set/
• [ ] shellwords/
• [ ] singleton/
• [ ] socket/
• [ ] strscan/
• [ ] tempfile/
• [ ] time/
• [ ] timeout/
• [ ] tmpdir/
• [ ] tsort/
• [ ] uri/
• [ ] yaml/
• [ ] zlib/ 

[soutaro]

I'm working for stdlib files now.