[FT] Add ReplacementsDict and ValidReplacementValue types for smtp replacements

[J1Loop]

New Types for Template Replacements Validation:

• Added ReplacementsDict TypedDict and ValidReplacementValue Union type to quipus/utils/types.py for validating template replacements.

Updates to __init__.py:

• Updated quipus/__init__.py to include the new ReplacementsDict and ValidReplacementValue in the imports and __all__ list.
• Updated quipus/utils/__init__.py to export the new types.

Updates to smtp_delivery.py:

• Imported ReplacementsDict and ValidReplacementValue in quipus/services/smtp_delivery.py.
• Modified the with_body_path method to use Optional[dict[str, ValidReplacementValue]] for the replacements parameter and added type checks for replacement values.

[pandasoncode]

OK!