Stablize v1.0.0

[Nugine]

The current API design works well.

Main features

• macro-based interfaces
• overload by limited argument types
• const-fn compatibility

MSRV policy

• bump MSRV in a minor release
• avoid unnecessary bumps

Something that may affect our design

• Tracking Issue for complex generic constants: feature(generic_const_exprs) rust-lang/rust#76560
• Tracking issue for generic const items rust-lang/rust#113521
• Tracking Issue for const_box rust-lang/rust#92521

Blockers

• Eager expansion #2
• convert_ascii_case tests: mismatch with heck #18
• unicode printable #28