Add ESM support

[nascosto]

Not having solid ESM support makes it hard to leverage this tool.

I'm getting this error when using tsx for example

export class TypesenseOperator extends Operator {
^

TypeError: Class extends value # is not a constructor or null
at (C:\git\Property\Typesense.KubernetesOperator\src\typesense-operator.ts:33:40)
at ModuleJob.run (node:internal/modules/esm/module_job:234:25)
at async ModuleLoader.import (node:internal/modules/esm/loader:473:24)
at async asyncRunEntryPointWithESMLoader (node:internal/modules/run_main:122:5)

If I copy in the operator code instead of relying on your library everything works fine.

Thank you!