Bug/exp overflow master

[mike-burrage-hedera]

Detailed description:

Applying bug fix from #409 to master.

From the original PR:

• In Entities.create/update, handle overflows during conversion of (seconds,nanos) to a long nanos timestamp and set the database values accordingly.
• Utilities.convertToNanos changed due to its implementation adding an additional runtime exception possibility (DateTimeException), rather than just the expected ArithmeticException.
• Tested update via RecordFileLoggerCryptoTest and RecordFileLoggerFileTest

Additions in this change that were not on the release/0.4 branch:

• Correcting a comment in RecordFileLoggerCryptoTest (on numeric overflow of expiration_ns, long max and min values are used, not null which indicates the value is unknown).
• Readding rest-api test data that includes a null expiration timestamp result as well as still testing the new max and min long values that represent the overflow case.
• Refactoring the rest integration test data setup which added confusion during the bug fix. json file integration_test_data.json along with comments at the top of integration.test.js should hopefully make this a bit more clear.

Which issue(s) this PR fixes:
Fixes #386

Special notes for your reviewer:

Checklist

• Documentation added
• Tests updated

[codecov]

Codecov Report

Merging #419 into master will increase coverage by 0.09%.
The diff coverage is 87.5%.

@@            Coverage Diff             @@
##           master     #419      +/-   ##
==========================================
+ Coverage   57.65%   57.74%   +0.09%     
==========================================
  Files          56       56              
  Lines        2477     2480       +3     
  Branches      323      324       +1     
==========================================
+ Hits         1428     1432       +4     
- Misses        902      903       +1     
+ Partials      147      145       -2

Impacted Files	Coverage Δ
...hedera/mirror/importer/parser/record/Entities.java	85.25% <100%> (ø)	⬆️
.../java/com/hedera/mirror/importer/util/Utility.java	56.81% <83.33%> (+0.09%)	⬆️
...irror/importer/parser/record/RecordFileLogger.java	84.19% <0%> (+0.45%)	⬆️

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[steven-sheehy]

LGTM. As discussed, I think we'll need input files to be specifiable per spec and more input tables to be available, but that can wait for another PR.