Support build_explain_clause(options = [])

[yahonda]

This commit implements build_explain_clause(options = []) that is no-op to remove the warning below because Oracle Database does not support something like explain analyze in MySQL.

$ bundle exec rspec spec/active_record/connection_adapters/oracle_enhanced_adapter_spec.rb:356
==> Loading config from ENV or use default
==> Running specs with ruby version 3.3.5
/home/yahonda/.rbenv/versions/3.3.5/lib/ruby/gems/3.3.0/bundler/gems/rails-cefd9e9942c5/activesupport/lib/active_support/logger_silence.rb:5: warning: logger was loaded from the standard library, but will no longer be part of the default gems starting from Ruby 3.5.0.
You can add logger to your Gemfile or gemspec to silence this warning.
==> Effective ActiveRecord version 7.1.4
Run options: include {:locations=>{"./spec/active_record/connection_adapters/oracle_enhanced_adapter_spec.rb"=>[356]}}
DEPRECATION WARNING: The current database adapter, OracleEnhanced, does not support explain options. To remove this warning, the adapter must implement `build_explain_clause(options = [])`. (called from block (3 levels) in <top (required)> at /home/yahonda/src/github.com/rsim/oracle-enhanced/spec/active_record/connection_adapters/oracle_enhanced_adapter_spec.rb:356)
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1 example, 0 failures

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Fix #2394
Refer to rails/rails#47043