Improve input validation error messages

[anna-geller]

Currently, invalid inputs generate either blank error messages like this one (just 500 response without any details):

or not specific enough as here where input "nr" should be integer but got a string:

Expected outcome

The error message should clarify:

1. For which input ID a wrong value has been provided
2. What is the expected type
3. What is the invalid value provided by the user

A friendlier error message schema:

Invalid input for '<input_id>': expected <expected_type> but received "<received value>"

• Invalid input for 'nr': expected INT but received "hello"
• Invalid input for 'payload': expected ARRAY of INT but received "[{"name": "kestra", "rating": "best in class"}]"