feat: Implement net.cidr_contains builtin (#471)

Major changes:
- Implement the `net.cidr_contains` builtin
- Enable the v0 and v1 test for `net.cidr_contains`
- Add the `netip` crate to standardize CIDR searching and other
  operations

Key Concept:
- Allow users to leverage the `net.cidr_contains` builtin to check
  whether an IPv4 or IPv6 CIDR contains a specified IP address or
  subnet.

Testing:
- All tests passing.

Signed-off-by: tjons <tylerschade99@gmail.com>

tests/opa.passing

@@ -46,6 +46,7 @@ v0/jsonschema
 v0/negation
 v0/nestedreferences
 v0/netcidrisvalid
+v0/netcidrcontains
 v0/numbersrange
 v0/numbersrangestep
 v0/objectfilter
@@ -150,6 +151,7 @@ v1/jsonremoveidempotent
 v1/jsonschema
 v1/negation
 v1/nestedreferences
+v1/netcidrcontains
 v1/netcidrisvalid
 v1/numbersrange
 v1/numbersrangestep
@@ -206,4 +208,4 @@ v1/uuid
 v1/varreferences
 v1/virtualdocs
 v1/walkbuiltin
-v1/withkeyword
+v1/withkeyword