fix: memory expansions

[enitrat]

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: #910
Resolves: #911

What is the new behavior?

• Fixes a bug where memory expansion was not always applied properly, as the max memory offset written could be different from the max theoritical memory offset passed in calls.
• As memory is always resized prior to calls / operations, removed length checks & expansions in the memory trait
• Fixes a bug where memory expansion was computed based on the max offset, even if the associated size written was zero.

Does this introduce a breaking change?

• Yes
• No

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This change is