Fix the circular initialization dependency #4658

[ministat]

Fix the issue #4658:

ModifierType and TypeDefinitionCategory has circular initialization dependency, as a result, if we access ModifierType before TypeDefinitionCategory, it will cause java.lang.ExceptionInInitializerError problem.

A UT is included. No document change.

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[ministat]

@li-boxuan Now that the CI tests have been passed. Could you please help take a look when you are free?

[li-boxuan]

Thank you!

[porunov]

LGTM. Thank you @ministat !
Verified that the test fails without the fix.

[janusgraph-automations]

💚 All backports created successfully

Status	Branch	Result
✅	v0.6

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