(opt): Small String Optimisations (SSO) - #15
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This PR attempts to improve performance by adding support for the Small String Optimisation (SSO) for the SOM
Stringvalues, by using thesmartstringcrate fromcrates.io, which allows inlining a string on the stack of up-to 23 bytes long.This PR only affects the bytecode interpreter (although it could also apply to the AST one).