Rails/RelativeDateConstant does not detect some types of relative dates

[nc-holodakg]

RelativeDateConstant looks for constants in a particular format like CONST = <offset>.ago but doesn't consider other forms, such as

START_DATE = 2.weeks.ago.to_date
RECENT_DATE = Date.yesterday
FUTURE_DATE = Time.zone.tomorrow

I looked briefly at the matchers, but I wasn't sure if using ‍`‍ (as described here) would be appropriate to match the relative methods like ago or since with arbitrary levels of nesting.

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Expected behavior

RelativeDateConstant adds offenses for a wider variety of relative date constants.

Actual behavior

None of the examples above produce offenses.

Steps to reproduce the problem

# date.rb
START_DATE = 2.weeks.ago.to_date
RECENT_DATE = Date.yesterday
FUTURE_DATE = Time.zone.tomorrow

$ rubocop date.rb

RuboCop version

$ bundle exec rubocop -V
0.93.1 (using Parser 2.7.2.0, rubocop-ast 1.1.1, running on ruby 2.7.1 x86_64-darwin19)

rubocop-rails version is 2.6.0, the logic for this particular cop doesn't seem to have changed since then.