Include token decimals in query responses

[tinker-michaelj]

Related issue(s):
Closes #1075

Summary of the change:

• Set the decimals field in TokenBalance and TokenRelationship messages returned from queries.
• NOTE: this PR also includes some unrelated EET changes helpful for recording cost snapshots in crypto/file mutations.

External impacts:
Nothing breaking; this information will simply be available in queries now.

Applicable documentation

• HAPI protobuf comments

[codecov]

Codecov Report

Merging #1078 (3ca6c66) into master (1288bbe) will increase coverage by 0.00%.
The diff coverage is 100.00%.

@@            Coverage Diff            @@
##             master    #1078   +/-   ##
=========================================
  Coverage     87.13%   87.14%           
  Complexity     5251     5251           
=========================================
  Files           435      435           
  Lines         15714    15718    +4     
  Branches       1619     1617    -2     
=========================================
+ Hits          13693    13697    +4     
  Misses         1559     1559           
  Partials        462      462           

Impacted Files	Coverage Δ	Complexity Δ
.../hedera/services/context/primitives/StateView.java	94.94% <ø> (ø)	45.00 <0.00> (ø)
...c/main/java/com/hedera/services/ServicesState.java	93.75% <100.00%> (+0.03%)	38.00 <0.00> (+1.00)
...hedera/services/keys/InHandleActivationHelper.java	100.00% <100.00%> (ø)	19.00 <0.00> (ø)
...rvices/queries/crypto/GetAccountBalanceAnswer.java	95.00% <100.00%> (+0.26%)	14.00 <0.00> (ø)
...era/services/records/TxnAwareRecordsHistorian.java	100.00% <100.00%> (ø)	10.00 <2.00> (-1.00)
...services/state/submerkle/RawTokenRelationship.java	86.66% <100.00%> (+0.30%)	16.00 <0.00> (ø)

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[ljianghedera]

LGTM.

[ljianghedera]

LGTM