Update RxJS 6.x to 7.x along with jasmine-marbles to 0.9.x

[psmul]

Spike how many problems it will bring (fixing imports and typing, changed behavior of operators) vs. benefits (check how smaller bundle size our libs will have).

• CHANGELOG
• summary of changes between 6.x. and 7.x

Additionally, as a connected topic after rxjs update, we also need to bump jasmine-marbles due to changes in runtime scheduler. Error: No test scheduler initialized

• CHANGELOG

[Xymmer]

move this ticket to jira

[schoechSICKAG]

Hi, when can we expect RxJS to be updated to version 7.x, as supported by Angular 15? See also issue #17857 Also applies to single package.json projects with NestJS and other libraries with Angular 15 that support RxJS ^7.4.0 Thanks 🚀