SDC: Allow Typing to filter for Dropdown component

[nsabale7]

IMPORTANT: All PRs must be linked to an issue (except for extremely trivial and straightforward changes).*

Fixes #764

Description
This PR allows to filter options based on typing in the dropdown component.

Type
Choose one: Bug fix

Screenshots (if applicable)

dropdown.mp4

Checklist

• I have read and acknowledged the Code of conduct.
• I have read the Contributing page.
• I have signed the Google Individual CLA, or I am covered by my company's Corporate CLA.
• I have discussed my proposed solution with code owners in the linked issue(s) and we have agreed upon the general approach.
• I have run ./gradlew spotlessApply and ./gradlew spotlessCheck to check my code follows the style guide of this project.
• I have run ./gradlew check and ./gradlew connectedCheck to test my changes locally.
• I have built and run the demo app(s) to verify my change fixes the issue and/or does not break the demo app(s).

[joiskash]

Looks good to me, google team can review

cc: @omarismail94 @santosh-pingle

[omarismail94]

This looks great @nsabale7 !!

Can you add an Espresso Test in QuestionnaireItemDropDownViewHolderFactoryEspressoTest to assert the number of items in the menu for different scenarios, e.g. no filtering, filtering with results, filtering with no results?

[omarismail94]

Great change @nsabale7 !

[jingtang10]

@shelaghm please take a look at the video - it looks amazing!

thanks @nsabale7

[shelaghm]

@nsabale7 great work!

@jingtang10 One question I have is if the dropdown component always allow people to type to filter or if it is something that is configurable and needs to be activated? Asking so I can document it properly in my design guidelines.

[jingtang10]

@nsabale7 great work!

@jingtang10 One question I have is if the dropdown component always allow people to type to filter or if it is something that is configurable and needs to be activated? Asking so I can document it properly in my design guidelines.

it would always allow filtering by typing.

[codecov]

Codecov Report

Merging #1722 (c4178bc) into master (8acbeb3) will increase coverage by 0.56%.
The diff coverage is 50.00%.

@@             Coverage Diff              @@
##             master    #1722      +/-   ##
============================================
+ Coverage     41.79%   42.35%   +0.56%     
  Complexity      384      384              
============================================
  Files           150      150              
  Lines          5405     5411       +6     
  Branches        971      973       +2     
============================================
+ Hits           2259     2292      +33     
+ Misses         2786     2761      -25     
+ Partials        360      358       -2     

Impacted Files	Coverage Δ
...iews/QuestionnaireItemDropDownViewHolderFactory.kt	60.00% <50.00%> (-1.54%)	⬇️
...ir/datacapture/views/OptionSelectDialogFragment.kt	85.50% <0.00%> (+14.49%)	⬆️

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