Add extra byte operators to make bytestring serialization easier

## Status

The current status is that we have a limited number of byte operators available: Length, Concatenation, Substring, and Extract.

## Expected

The expectation is to add extra byte operators that will facilitate easier serialization of strings.

## Solution

Adding functions such as 'find', 'split', 'join', and 'replace' would make bytestring manipulation a lot easier. Those are just a few examples, but I'm sure there's many more functions that could be introduced.

## Dependencies

No dependencies

## Urgency

Given the increasing use of boxes, which necessitate the use of bytestrings, there is an urgency to allow for easier data manipulation within a smart contract. Without them, it's difficult to use boxes as effectively as they could be.