Perf/journal for evm state

[LukaszRozmej]

Changes:

Uses Journals with snapshots in EvmState instead of copying data

Types of changes

What types of changes does your code introduce?
Put an x in the boxes that apply

• Bugfix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• Documentation Update
• Code style update (formatting, renaming)
• Refactoring (no functional changes, no api changes)
• Build related changes
• Other (please describe):

Testing

Requires testing

• Yes
• No

In case you checked yes, did you write tests??

• Yes
• No

Needs manual testing on mainnet nodes

[tkstanczak]

please try to add many comments documenting this thing -> it is a great new piece of code but sooner or later we need to improve comments quality and it may be good to ask for it now especially for big new clean pieces of code