Optimize Restriction Checks

[danieliser]

Restructure the restriction checking process to be more performant, and allow optimizing for more complex setups.

• Check user requirements before checking content match rules. If the user is logged in with correct role, this restriction doesn't apply anyways.
• Checking user requirements & content matching should occur in same function/method. This simplifies all calls to check if something is restricted in a controlled an optimized way. Currently they are checked separately and each place they are checked is slightly different leading to non-uniformity and difficulty in reliability
• Refactor get_applicable_restrictions to allow filtering based on certain performant filters such as login status, protection method or other segment-able settings.
• Priority sort should come after filtering ^^, this way results are filtered & sorted on request. When hiding/filtering content, should only receive back matches that fit that.
• Query rules should have a way to filter them for removing/including/only global main query rules. This allows excluding main query rules from non main query posts such as search results pages.