Improve handling of invalid API parameter types #19027

Description:

Fixes #19009

Add a simple check to throw an exception if an API call passes a string value for idSubtable

Includes a new test to asset that the exception is thrown when a string value is supplied and that no exception will be thrown for numeric values.

Review

• [ ] Functional review done
• [ ] Potential edge cases thought about (behavior of the code with strange input, with strange internal state or possible interactions with other Matomo subsystems)
• [ ] Usability review done (is anything maybe unclear or think about anything that would cause people to reach out to support)
• [ ] Security review done
• [ ] Wording review done
• [ ] Code review done
• [ ] Tests were added if useful/possible
• [ ] Reviewed for breaking changes
• [ ] Developer changelog updated if needed
• [ ] Documentation added if needed
• [ ] Existing documentation updated if needed