GH-3654 Support for JSON-LD 1.1

[hmottestad]

GitHub issue resolved: #3654

Briefly describe the changes proposed in this PR:

• moved old JSON-LD code to a new module named jsonld-legacy
• implemented support for everything except hierarchical mode using HASMAC-JSON-LD, a fork of Titanium JSON-LD with performance improvements and modifications to make the integration with RDF4J simpler

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PR Author Checklist (see the contributor guidelines for more details):

• my pull request is self-contained
• I've added tests for the changes I made
• I've applied code formatting (you can use mvn process-resources to format from the command line)
• I've squashed my commits where necessary
• every commit message starts with the issue number (GH-xxxx) followed by a meaningful description of the change

[hmottestad]

TODO:

• Support for framing
• License fix

[hmottestad]

Todo: Optimize imports

[hmottestad]

Develop branch

Benchmark                               Mode  Cnt     Score     Error  Units
ReadWriteBenchmark.parseFromString      avgt    5  2163.850 ± 183.838  ms/op
ReadWriteBenchmark.writeToStringWriter  avgt    5  2136.912 ± 137.561  ms/op

This branch

Benchmark                               Mode  Cnt     Score     Error  Units
ReadWriteBenchmark.parseFromString      avgt    5  1491.179 ± 133.298  ms/op
ReadWriteBenchmark.writeToStringWriter  avgt    5  3518.826 ± 556.206  ms/op

Develop branch is faster at writing JSON-LD. Might be worth looking into, but the difference isn't too bad.