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>

README.md

@@ -303,11 +303,9 @@ The following test suites don't pass fully due to missing builtins:
 - `jwtverifyhs384`
 - `jwtverifyhs512`
 - `jwtverifyrsa`
-- `netcidrcontains`
 - `netcidrcontainsmatches`
 - `netcidrexpand`
 - `netcidrintersects`
-- `netcidrisvalid`
 - `netcidrmerge`
 - `netcidroverlap`
 - `netlookupipaddr`