Canonicalize R4 topic subscriptions

[fil512]

Added support for Topic Subscription Filters. In R4B and R5, SubscriptionTopic notifications
will interpret subscription filters as FHIR Search Parameters and perform an in-memory match of the focus resource
against the search parameters. For R4 or user-generated event notifications, the caller can specify a custom
implementation of ISubscriptionTopicFilterMatcher on the call to SubscriptionTopicDispatcher.dispatch() to provide
custom filter matching logic.

Also added support for Subscriptions R5 Backport to R4 as documented in http://build.fhir.org/ig/HL7/fhir-subscription-backport-ig/components.html.

[codecov]

Codecov Report

Patch coverage has no change and project coverage change: +1.84 🎉

Comparison is base (2f5ffe7) 81.32% compared to head (1fa2ba5) 83.17%.

❗ Current head 1fa2ba5 differs from pull request most recent head 20ce6da. Consider uploading reports for the commit 20ce6da to get more accurate results

Additional details and impacted files

@@             Coverage Diff              @@
##             master    #4913      +/-   ##
============================================
+ Coverage     81.32%   83.17%   +1.84%     
- Complexity    23650    25515    +1865     
============================================
  Files          1425     1553     +128     
  Lines         86399    93071    +6672     
  Branches      11677    12397     +720     
============================================
+ Hits          70265    77409    +7144     
+ Misses        10947    10207     -740     
- Partials       5187     5455     +268     

see 1512 files with indirect coverage changes

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[TipzCM]

Some points to fix.

Approved but points should be addressed.