Make dynamic array in acir gen efficient

[kevaundray]

Problem

Related to #1969 (comment)

The way we are generating acir opcodes for dynamic arrays follows too closely to the SSA IR. ie for each array_set, we are creating a new array and then copying over the old array into the new array and then setting just one value in that array at the specified index.

Happy Case

A rough solution would see an array_set and change the pointer to look at the new array's ID as the pointer for the new array and then only modify one value in that array.

Alternatives Considered

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Additional Context

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Would you like to submit a PR for this Issue?

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Support Needs

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