Fix Indexing of lastUpdated for Deleted Resources

[alexanderkiel]

When deleting a resource, a resource content with type and id only was
stored and indexed. However, because the lastUpdated timestamp is not
part of the resource content, it was associated to the resource content
before indexing. So the lastUpdate timestamp was indexed even for the
deleted version of a resource, so that a search for _lastUpdated found
that version and returned it as match in results.

This patch completely omits storing and indexing of deleted resource
contents and uses the hash consisting of all zero bytes for the
resource handle. Pulling such a deleted resource handle will return a
resource content consisting of type and id only immediately.

[codecov]

Codecov Report

Merging #469 (0eb286a) into develop (7e257b4) will increase coverage by 0.06%.
The diff coverage is 95.89%.

@@             Coverage Diff             @@
##           develop     #469      +/-   ##
===========================================
+ Coverage    91.55%   91.62%   +0.06%     
===========================================
  Files          230      231       +1     
  Lines        13392    13407      +15     
  Branches       440      440              
===========================================
+ Hits         12261    12284      +23     
+ Misses         691      683       -8     
  Partials       440      440              

Impacted Files	Coverage Δ
modules/db-tx-log/src/blaze/db/tx_log/spec.clj	86.20% <ø> (ø)
modules/db/src/blaze/db/impl/codec.clj	99.44% <ø> (+0.54%)	⬆️
...odules/fhir-structure/src/blaze/fhir/hash/spec.clj	85.71% <80.00%> (+19.04%)	⬆️
...b-tx-log-kafka/src/blaze/db/tx_log/kafka/codec.clj	90.90% <90.90%> (ø)
...ules/db-tx-log-kafka/src/blaze/db/tx_log/kafka.clj	97.33% <100.00%> (+9.16%)	⬆️
...b/src/blaze/db/impl/index/compartment/resource.clj	100.00% <100.00%> (ø)
modules/db/src/blaze/db/node.clj	94.78% <100.00%> (+0.02%)	⬆️
modules/db/src/blaze/db/node/resource_indexer.clj	94.59% <100.00%> (+0.84%)	⬆️
modules/db/src/blaze/db/node/transaction.clj	100.00% <100.00%> (ø)
modules/db/src/blaze/db/node/tx_indexer/verify.clj	98.20% <100.00%> (+0.02%)	⬆️
... and 2 more