Consider creating a Principal boa context once for AzleIntoJsValue and AzleTryFromJsValue

[lastmjs]

Currently in AzleIntoJsValue and AzleTryFromJsValue for the Principal types we create a fresh boa context and execute the @dfinity/principal JS code directly. This might incur high runtime costs for developers. Consider creating one context on init and storing it in global memory, then referencing it in the trait implementations.