Make the maximum block size configurable (#7499)

* Make the maximum block size configurable

This pr makes the maximum block size configurable. The maximum block
size is used after proposing a new block to check if the new block is
not exceeding the maximum.

* Update primitives/consensus/common/src/evaluation.rs

Co-authored-by: André Silva <123550+andresilva@users.noreply.github.com>

* Added comment

Co-authored-by: André Silva <123550+andresilva@users.noreply.github.com>