Fixes cartant#100

There's also a proposed fix PR in the upstream repo cartant#114 but I avoided looking at that solution to avoid any license issue, so this solution might be different.

• Fix: if the shareReplay operator was passed an object config, then require bufferSize to be in that object.
• Fix: the rule wasn't handling if shareReplay is imported under a namespace.
  • (Might need to review the entire project. Since rxjs now recommends importing from "rxjs" instead of "rxjs/operators", there's a risk that many rules also fail to account for that new paradigm. Note that this rule is the only rule that tests namespace imports for all cases, so we at least should expand that coverage/type of test.)