feat: esm support on Odata

[BrigittaK307]

The generateESM flag, used in both generator and openapi generator packages controls if the generated client code follows the ECMACScript Module (ESM) syntax or the default, CommonJS one.
when generateESM: true is set, the generator produces code which folllows the ESM syntax.

[deekshas8]

It's almost there, just some code cleanup and restructuring needed, Please consider ALL comments and lets discuss if you have questions.

[deekshas8]

A barel file is only for exporting. You shouldn't define types here. Please move it to a more appropriate file.

[deekshas8]

Suggested change

	export { getCommonCliOptions } from './options';
	export * from './options';

The internal barel file exports everything. index.ts determines the public api and hence only exports public facing types, functions, etc.