Take into account proof size for transaction payment and priority (#13958)

* use both proof size and weight

* old tests pass, todo: add tests for weight proof size

* refactor priority calculation

* refactor

* normalize dimensions

* refactor

* update comments

* use higher resolution

* test multiplier can grow

* restore ref time test cases

* fix hacky test

* fmt

* update tests

* revert to original error rate

* update targetedFeeAdjustment doc

* Update frame/transaction-payment/src/lib.rs

Co-authored-by: Oliver Tale-Yazdi <oliver.tale-yazdi@parity.io>

* import defensive

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Co-authored-by: parity-processbot <>
Co-authored-by: Oliver Tale-Yazdi <oliver.tale-yazdi@parity.io>