Component ID getters in world and query copy ID slice

[mlange-42]

Both return a copy of the archetype's component IDs slice, for safety.
This means that the result can be manipulated safely,
but also that calling the method may incur some significant cost.

[coveralls]

Pull Request Test Coverage Report for Build 7502786774

• 0 of 0 changed or added relevant lines in 0 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage remained the same at 100.0%

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Totals
Change from base Build 7502287386:	0.0%
Covered Lines:	4814
Relevant Lines:	4814

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💛 - Coveralls