validate parameters through pydantic

adresses #457 (closed)

changes are quite vastly spread. Basically:

modifies lib.types:

• adds ValidatePublicMembers class
  • its mixed into all the flagging function-mixins and ensures all flagging methods are decorated with the qcMethodSignature decorator (that triggers pydantic type checking based on assigned typehints)
• adds comparative types Int and Float, that can instantiate constrained typehints through comparative syntax
  • Int > 0 (integer greater zero), Float[0,1] (float in [0,1] interval.), Float <= 10 (float smaller or equal 10)
• adds additional types (pydantic basemodels) for common constructs like frequency strings:
  • FreqStr, OffsetStr, OffsetLike,ArrayLike, SaQC, ...
• adds context aware types for qc functions (checked against signature context):
  • SaQCField, NewSaQCField

modifies funcs.*

• modifies all the qc functions signatures with pydantic aligned type hinting
• removes prior, functional validation framework (validate_window,validate_offset,...)