Add eql/equal support to RSpec/PredicateMatcher #2510

Job	Run time
Test coverage	17s
Edge RuboCop: internal_investigation	15s
Ruby 2.7: internal_investigation	25s
Edge RuboCop: spec	20s
Confirm config and documentation	13s
Oldest RuboCop: spec	21s
Ruby 2.7: spec	35s
Prism	29s
Ruby 3.0: internal_investigation	15s
RSpec 4	19s
Ruby 3.0: spec	17s
Ruby 3.1: internal_investigation	18s
Ruby 3.1: spec	16s
Ruby 3.2: internal_investigation	12s
Ruby 3.2: spec	17s
Ruby 3.3: internal_investigation	14s
Ruby 3.3: spec	21s
Ruby 3.4: internal_investigation	15s
Ruby 3.4: spec	22s
Ruby ruby-head: internal_investigation	11s
Ruby ruby-head: spec	19s
Ruby jruby-9.4: internal_investigation	1m 25s
Ruby jruby-9.4: spec	1m 18s
	9m 14s

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