Improve nuget package metadata

[Seramis]

Description

Update NuGet workflow and metadata.

• Removed redundant PackageReleaseNotes from the "Pack" step in the CI workflow.
• Updated project description to emphasize database optimization, Base32 encoding, AOT readiness, and protection against enumeration attacks.
• Refined metadata by adjusting tags, linking PackageProjectUrl to version-specific paths, changing license to use PackageLicenseExpression, and adding copyright info.

Type of Change

• Bug fix (non-breaking change that fixes an issue)
• New feature (non-breaking change that adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)
• Documentation update
• Other (please specify):

Checklist

• The PR is submitted to the correct branch (main).
• My code follows the project's coding style. (.editorconfig)
• I have commented my code, particularly in hard-to-understand areas and public interfaces.
• I have added or updated tests for the changes I made.
• All new and existing tests passed.
• I have updated the documentation where applicable.