feat: cache code_hash

[obatirou]

Pull Request type

Please check the type of change your PR introduces:

• Bugfix
• Feature
• Code style update (formatting, renaming)
• Refactoring (no functional changes, no API changes)
• Build-related changes
• Documentation content changes
• Other (please describe):

What is the current behavior?

Resolves: #840

What is the new behavior?

Code hash cache in storage

Does this introduce a breaking change?

• Yes
• No

---

This change is 

[enitrat]

lgtm, however the devX regarding mocking calls in tests looks a bit bad - can we identify common patterns (like what calls do we need to constantly mock) and add a helper function ?

We can make a new issue for that

[obatirou]

lgtm, however the devX regarding mocking calls in tests looks a bit bad - can we identify common patterns (like what calls do we need to constantly mock) and add a helper function ?

We can make a new issue for that

Indeed
Created an issue for this #931
Merging the current PR