feat: Add block and timestamp helper properties to env

[DanielSchiavini]

What I did

Add block and timestamp helper properties to env

How I did it

Passing the call to evm.patch

How to verify it

Tests are included

Description for the changelog

• Add block and timestamp helper properties to env

Cute Animal Picture

[charles-cooper]

maybe instead of dynamically creating the class, we can have BlockEnv inherit from something like MagicAttributeSet?

[charles-cooper]

also i think if we are going to do this we should plan to do it for everything in the patcher.