Feature/4.0.0

[Timovzl]

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• Generic JSON serializers instead of generated.

• Removed #if NET7/8 conditionals, now that 8 is the minimum version.

• Upgraded LangVersion and handled compiler suggestions.

• Suppressions and summary corrections.

• Implemented formatting/parsing via default interface implementations and (.NET 10+) extension members.

• Prepared outcommented precompiler directives for a .NET 10 patch upgrade, to reduce assembly bloat then.

• Also corrected how formattable/parsable is determined based on wrapped types.

• Also fixed a few bugs.

• Generator performance and cleanup.

• Added serialization to/from deepest underlying type (recursive).

• Also cleaned up the way in which lines not being source generated are outcommented.

• Also improved source generator performance.

• Also prevented transient issues when reporting warnings on wrapper types.

• Added wrapper EF collations, collation checks, and provider comparers.