#1515 fix date formatting in JSONObject, add tests

[robfrank]

What does this PR do?

Add a date formatter for LocalDataTime to JsonObject.

Motivation

The JsonObjet has a single DateTimeFormater dedicated to Date and doen't provide a dedicated formatter for LocalDatetime, but inside the database there are 2 different formatters configurable with properties:

        alter database `arcadedb.dateImplementation` `java.time.LocalDate`;
        alter database `arcadedb.dateTimeImplementation` `java.time.LocalDateTime`;
        alter database `arcadedb.dateFormat` 'dd MM yyyy GG';
        alter database `arcadedb.dateTimeFormat` 'dd MM yyyy GG HH:mm:ss';

Related issues

#1515

Checklist

• I have run the build using mvn clean package command
• My unit tests cover both failure and success scenarios

[codacy-production]

Coverage summary from Codacy

See diff coverage on Codacy

Coverage variation	Diff coverage
✅ +0.06%	✅ 87.93%

Coverage variation details

	Coverable lines	Covered lines	Coverage
Common ancestor commit (1653a85)	68165	43617	63.99%
Head commit (0a91b2a)	68186 (+21)	43670 (+53)	64.05% (+0.06%)

Coverage variation is the difference between the coverage for the head and common ancestor commits of the pull request branch: <coverage of head commit> - <coverage of common ancestor commit>

Diff coverage details

	Coverable lines	Covered lines	Diff coverage
Pull request (#1887)	58	51	87.93%

Diff coverage is the percentage of lines that are covered by tests out of the coverable lines that the pull request added or modified: <covered lines added or modified>/<coverable lines added or modified> * 100%

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