[FR]: Replace spotless with Ktlint/Ktfmt

[JoseAlcerreca]

Is there an existing issue for this?

• I have searched the existing issues

Describe the problem

The spotless plugin is creating some build performance issues.

Describe the solution

We should move to ktlint or ktfmt.

Block just shared a timely post: https://engineering.block.xyz/blog/adopting-ktfmt-and-detekt

Additional context

Note that the alternatives don't support everything spotless does, like checking the copyright headers.

Any feedback is welcome

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