Rewrite Array#find in ruby

Inspired by https://bugs.ruby-lang.org/issues/20182 and https://github.com/ruby/ruby/pull/9533.

This PR provides a performance boost to Array#find when run using JIT
compilation. This is achieved by implementing Array#find in Ruby, which
the JIT compiler can optimise.

[PR#15189](https://github.com/ruby/ruby/pull/15189) added a C
implementation for Array#find instead of relying on Enumerable#find.
This PR extends this by adding a Ruby implementation.

I used the so_fasta benchmark to measure performance. No change in
interpreted performance before/after:

  $ benchmark-driver -e "~/.rubies/ruby-master/bin/ruby; ~/.rubies/ruby-array-find-native/bin/ruby" ../benchmark/so_fasta.rb
  Calculating -------------------------------------
                       ~/.rubies/ruby-master/bin/ruby   ~/.rubies/ruby-array-find-native/bin/ruby
              so_fasta                          0.393                                       0.393 i/s -       1.000 times in 2.543209s 2.545514s

  Comparison:
                           so_fasta
  ~/.rubies/ruby-master/bin/ruby:         0.4 i/s
  ~/.rubies/ruby-array-find-native/bin/ruby:         0.4 i/s - 1.00x  slower

With YJIT enabled Array#find is almost twice as fast:

  $ benchmark-driver -e "~/.rubies/ruby-array-find-native/bin/ruby; ~/.rubies/ruby-array-find-native/bin/ruby --yjit" ../benchmark/so_fasta.rb
  Calculating -------------------------------------
                       ~/.rubies/ruby-array-find-native/bin/ruby   ~/.rubies/ruby-array-find-native/bin/ruby --yjit
              so_fasta                                     0.393                                              0.770 i/s -       1.000 times in 2.547550s 1.298371s

  Comparison:
                           so_fasta
  ~/.rubies/ruby-array-find-native/bin/ruby --yjit:         0.8 i/s
  ~/.rubies/ruby-array-find-native/bin/ruby:         0.4 i/s - 1.96x  slower

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