fix(v2): Don't require macro callers to have std::str::FromStr in scope

[sbernauer]

Description

Fixes

error[E0599]: no function or associated item named `from_str` found for struct `TrinoCatalogName` in the current scope
   --> rust/operator-binary/src/crd/catalog/mod.rs:136:1
    |
136 | / attributed_string_type! {
137 | |     TrinoCatalogName,
138 | |     "The name of a TrinoCluster",
139 | |     "lakehouse",
...   |
147 | |     is_valid_label_value
148 | | }
    | | ^
    | | |
    | |_function or associated item not found in `TrinoCatalogName`
    |   function or associated item `from_str` not found for this struct
    |
    = help: items from traits can only be used if the trait is in scope
    = note: this error originates in the macro `attributed_string_type` (in Nightly builds, run with -Z macro-backtrace for more info)
help: trait `FromStr` which provides `from_str` is implemented but not in scope; perhaps you want to import it
    |
  1 + use std::str::FromStr;
    |

Definition of Done Checklist

• Not all of these items are applicable to all PRs, the author should update this template to only leave the boxes in that are relevant
• Please make sure all these things are done and tick the boxes

Author

• Changes are OpenShift compatible
• CRD changes approved
• CRD documentation for all fields, following the style guide.
• Integration tests passed (for non trivial changes)
• Changes need to be "offline" compatible

Reviewer

• Code contains useful comments
• Code contains useful logging statements
• (Integration-)Test cases added
• Documentation added or updated. Follows the style guide.
• Changelog updated
• Cargo.toml only contains references to git tags (not specific commits or branches)

Acceptance

• Feature Tracker has been updated
• Proper release label has been added

[siegfriedweber]

LGTM