bugfix/964: define actual maxKeyLength per type for changeKeyX

[JoernBerkefeld]

PR details

What changes did you make? (Give an overview)

• closes [BUG] allow 200 chars for dataExtensions keys on changeKeyX #964

Is there anything you'd like reviewers to focus on?

...

Checklist

• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• n/a test scripts updated
• n/a Wiki updated (if applicable)

[github-actions]

Coverage Report

Commit: 3a2da96
Base: develop@9ff3bc3

Type	Base	This PR
Total Statements Coverage	45.98%	45.99%  (+0.01%)
Total Branches Coverage	36.69%	36.73%  (+0.04%)
Total Functions Coverage	53.02%	53.02%  (+0%)
Total Lines Coverage	45.9%	45.91%  (+0.01%)

Details (changed testable files):

File	Statements	Branches	Functions	Lines
lib/metadataTypes/MetadataType.js	63.66%	62.42%	73.49%	63.46%