fix(integration config): copy and deepcopy implementations

[Kyle-Verhoog]

IntegrationConfig has a broken implementation of deepcopy and a non-existent/broken implementation for copy since it falls back to using dict.copy.

This PR fixes the bug in the deepcopy implementation and adds an implementation for copy as well as some basic tests.

[jd]

WFM I hope we have a use case for copy if we provide it?

[Kyle-Verhoog]

👍 @jd yes, we do. It's actually broken right now to use our config instances with the Pin because it does a copy.

dd-trace-py/ddtrace/pin.py

Lines 163 to 176 in 1dd0d14

	@debtcollector.removals.removed_kwarg("app_type")
	def clone(self, service=None, app=None, app_type=None, tags=None, tracer=None):
	"""Return a clone of the pin with the given attributes replaced."""
	# do a shallow copy of Pin dicts
	if not tags and self.tags:
	tags = self.tags.copy()
	# we use a copy instead of a deepcopy because we expect configurations
	# to have only a root level dictionary without nested objects. Using
	# deepcopy introduces a big overhead:
	#
	# copy: 0.00654911994934082
	# deepcopy: 0.2787208557128906
	config = self._config.copy()