improve Token::from_encoded

[asmello]

Non-breaking change. Accept owned or borrowed strings as input in Token::from_encoded.

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 80.00000% with 1 line in your changes missing coverage. Please review.

Project coverage is 95.7%. Comparing base (f3c23b9) to head (c0aa57f).

Files with missing lines	Patch %	Lines
src/token.rs	80.0%	1 Missing ⚠️

Additional details and impacted files

Files with missing lines	Coverage Δ
src/token.rs	97.6% <80.0%> (+<0.1%)	⬆️