ResolvedTransactionView: array writable_cache

[apfitzge]

Problem

• ResolvedTransactionView uses Vec<bool> for storing the cached is_writable
• This allocates for every transaction

Summary of Changes

• Remove allocation (in simplest way possible) using statically sized (256) bool array

Fixes #

[apfitzge]

plan to benchmark different approaches here;

• bool array
• bitset

however, just doing the simplest approach to remove the allocation-per-transaction for now, while getting code to use new tx-type into master. Easier to evaluate and compare approaches then once the allocation is gone.