refactor!: merge proc-macro into single crate and align implementation

[DDtKey]

Description:

Merge proc-macro for actix-web-grants, poem-grants & rocket-grants into single crate to improve maintainability and get rid of repetitive changes.

Due to alignment some changes are included into this PR:

• rename type to ty due to changes in syn2 (keywords are disallowed)
• allow combination of authorities by all/any flag
• rename secure to expr and allow to be combined
• error attribute is available in all crates

Checklist:

• Tests for the changes have been added (for bug fixes / features);
• Docs have been added / updated (for bug fixes / features).
  • Partially, docs still something to improve