ChunkLoader to concrete class

[dktapps]

Problem description

Currrently everywhere in the core code uses new class implements ChunkLoader{}, which is needlessly annoying boilerplate code.

Proposed solution

There's no obvious reason to implement ChunkLoader now instead of just creating an object. It should be directly converted to a final class.

Alternative solutions or workarounds

No response

[dktapps]

Implemented by #6730