Remove AEP-128 rules

[rambleraptor]

Fixes #9

This removes all rules for AIP-128 (Declarative-friendly). None of these are in use for the AEPs.

[toumorokoshi]

I haven't stated this directly, but I was kind of wondering if we wanted to keep the "declarative-friendly" annotation around?

I never liked the fact that we had good guidance move into other AEPs, but OTOH I don't think we can get all the good declarative-friendly guidance as MUST. We may need to conditionally enable some rules, and we'll need some flag to detect that we want those rules on.

WDYT?

[rambleraptor]

Couple thoughts:

• Some of these PRs are old, but the goal is to annotate every lint rule with Should/Must, where Must rules cannot be disabled. We should keep Should rules around in the linter. I'll make sure all of this gets backported to past PRs.
• I don't think any of these rules - annotations, reconciling - will impact our definition of declarative-friendly, but I may be mistaken.
• The DECLARATIVE_FRIENDLY annotation would be a stronger version of AEP-compliant, right? You can be AEP-compliant, but not DECLARATIVE_FRIENDLY if you follow all of the must rules and none of the shoulds?