feat: [NPM] num ACL rules for v2 & update existing metrics

[huntergregory]

The following updates with UTs:

• Adds ACL rule metrics to v2
  • for windows: add the number of ingress and egress rules
  • for Linux: same but add 1 if any ACLs are ingress and 1 if any are egress (for the jumps to the policy ingress/egress chains)
• Moves v2 metric updates in ResetIPSets() from OS to the generic ipsetmanager (and also clears all caches in this function)
• in v1 and v2, moves ipset/acl rule exec times to be the exact time of the OS call (and no other code before/after)
• Updates a tiny flaw in ipsm.go if there were a flush success and destroy failure while resetting ipsets

[matmerr]

I get that we already had this but not sure how I feel about using string, overriding the String() method can lead to lost or misinterpreted information since it's rarely pointed to during an investigation

for example if we add a new property to NPMNetwork and try to print write to stdout, the dev would need to make sure to update this method to write the new property, string() can be a lot of maintenance

[rbtr]

agree, implementing String() does feel a little Java to me 🙂

[vakalapa]

Discussed this internally and team decided to change this func to PrettyPrint() and will be tackled in a separate PR

[huntergregory]

resolved in #1235