timers breaking when running second parser

[KwilLuke]

If a second parser class is instantiated, the JavaScript's built in time functions (e.g. Date.now()) seem to stop working, which causes the TTL cache to not work as intended.

Based on the error that is being thrown, it looks like it is something with the wasm_exec.js file being instantiated twice. To fix this bug, it may require some refactoring so that the wasm_exec.js file is only instantiated once, regardless of how many parser classes are created.