Stats release (v0.5.0)

• Dropped support for python 3.7, added support for python 3.11 (#171)

• Added statistics module (#141)

• Dropped support for pydantic 1, added support for pydantic 2 (#168)

• Fixed bug when labels would sometimes have a different length from requests and responses (#180)

• Removed arbitrary arguments from label and condition factories (#179)

• Removed normalize function from dff.scipt (#194)

• Added basic user guide (#177)

• Various tutorial updates