Add updateDelay to LinearSmoothing

[acortelyou]

Summary

Adds an updateDelay to LinearSmoothing as suggested in discussion https://github.com/awawa-dev/HyperHDR/discussions/542

I have verified this compiles but have not tested the functionality yet.

Hoping to get initial feedback on if this is the right approach.

What kind of change does this PR introduce? (check at least one)

• [ ] Bugfix
• [x] Feature
• [ ] Code style update
• [ ] Refactor
• [ ] Docs
• [ ] Build-related changes
• [ ] Other, please describe:

If changing the UI of web configuration, please provide the before/after screenshot:

Does this PR introduce a breaking change? (check one)

• [ ] Yes
• [ ] No
• [x] Not sure