Tracking Issue for refactoring `types.rs`

[Y-Nak]

While refactoring types.rs in #6680, I found that types.rs contains not only the types group but also other groups like the cast group.
This issue is a tracking issue for refactoring types.rs to avoid a too large PR and split them into small PRs.

• types group(Refactor types lints #6725):
  • BOX_VEC
  • VEC_BOX
  • OPTION_OPTION
  • LINKEDLIST
  • BORROWED_BOX
  • REDUNDANT_ALLOCATION
  • RC_BUFFER
• casts group(Refactor casts lint #6873):
  • CAST_PRECISION_LOSS
  • CAST_SIGN_LOSS
  • CAST_POSSIBLE_TRUNCATION
  • CAST_POSSIBLE_WRAP
  • CAST_LOSSLESS
  • UNNECESSARY_CAST
  • CAST_PTR_ALIGNMENT
  • FN_TO_NUMERIC_CAST
  • FN_TO_NUMERIC_CAST_WITH_TRUNCATION
  • CHAR_LIT_AS_U8
  • CAST_REF_TO_MUT
  • PTR_AS_PTR
• unit_type group (Refactor unit types #6889):
  • LET_UNIT_VALUE
  • UNIT_CMP
  • UNIT_ARG
• another:
  • ABSURD_EXTREME_COMPARISONS
  • INVALID_UPCAST_COMPARISONS
  • IMPLICIT_HASHER
  • TYPE_COMPLEXITY: I think this lint should be grouped into types but the implementation of LateLintPass seems slightly different from that of Types. needs further discussion.

[Y-Nak]

@rustbot label +I-suggestion-causes-error +C-tracking-issue

[Y-Nak]

@rustbot label -I-suggestion-causes-error

[flip1995]

+1 for splitting that module up further.