Migrate remaining rules from DeclarationV1 API to DeclarationV2

[calda]

This PR migrates the remaining rules using the DeclarationV1 API to instead use the improved DeclarationV2 API.

Now that all of the call sites are migrated, this PR also deletes the DeclarationV1 API and renames DeclarationV2 to simply Declaration.

Each commit is an individual step that can be reviewed independently. This PR doesn't make any functional changes, except where necessary to support the behavior differences between the old and new Declaration API. The biggest changes were to organizeDeclarations, which had to be restructured a bit.

[codecov]

Codecov Report

Attention: Patch coverage is 99.12088% with 8 lines in your changes missing coverage. Please review.

Project coverage is 95.44%. Comparing base (01d7248) to head (08f8177).
Report is 11 commits behind head on develop.

Files with missing lines	Patch %	Lines
Sources/DeclarationType.swift	98.03%	5 Missing ⚠️
Sources/Rules/OrganizeDeclarations.swift	99.20%	2 Missing ⚠️
Sources/Formatter.swift	92.85%	1 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##           develop    #1954      +/-   ##
===========================================
+ Coverage    95.19%   95.44%   +0.24%     
===========================================
  Files          138      138              
  Lines        25284    24939     -345     
===========================================
- Hits         24069    23802     -267     
+ Misses        1215     1137      -78     

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