feat: consistent hash scheduling implemented as `DistributionPolicy`

[milenkovicm]

Which issue does this PR close?

Closes #.

Rationale for this change

pluggable DistributionPolicy provides a way to extend scheduler task binding policies. with consistent hash task binding policy being quite use case specific implementing it as DistributionPolicy would make a sense. This would reduce api surface we need to maintain.

follow up needed:

• improved tests
• example how to use it
• documentation

What changes are included in this PR?

• custom DistributionPolicy for consistent hash scheduling
• moved to its own submodule
• policy has been removed from out of the box policy, users should configure it programmatically

Are there any user-facing changes?

• consistent hash option removed from scheduler configuration