Feature/frontend remove rxjs

[rohanpurohit]

This PR:

• Remove RxJs from our stack and use redux instead for all those functionalities.

[rohanpurohit]

@ethanjli current status of this PR:

• ScreenLock which used RxJs now works with redux
• Discard Alarm Limits Modal popup works with redux
• MultiStep Wizard opening and closing works (but it clearly has bugs, seems like submit, cancel are not discarding state, I did not get time to properly understand the bug!) so maybe it can be fixed by someone else/you or it could be a blocker for this PR.
• Rotary encoder highlighting (I could not test it) so the status is unknown! which could again be a blocker!

I guess changes in this PR could be reviewed more carefully and worked on by someone once #446 is merged, which is maybe good to merge from my side, if there are no regressions introduced in that PR.

anyway, I guess this will be the last change by me on this PR.