[MOD-531]: check_user_profile support for Ruby SDK

[varbhat]

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Description of the pull request

Context: https://getstream.io/moderation/docs/guides/moderate-username-and-images/

Ruby SDK was missing support for Moderating Usernames and Images. This PR adds the support for that.

Usage:

client.moderation.check_user_profile('user-id', {username: 'bad_username'})
client.moderation.check_user_profile('user-id', {image: 'https://example.com/profile.jpg'})
client.moderation.check_user_profile('user-id', {username: 'bad_username', image: 'https://example.com/profile.jpg'})

Apart from this, I have added a rule to silence Naming/PredicateMethod which was newly introduced in rubocop. verify_webhook function in this SDK didn't satisfy this rule and the rubocop(even the latest commit of master before this PR throws this linter error). Instead of changing the signature of verify_webhook which could possibly break existing systems, I have added a rule to silence it.