PLU-309: [TILES-ATOMIC-INCREMENT-3] enhance multirow-multicol UI with custom styles and operators

[pregnantboy]

TLDR;

FRONTEND-ONLY
For update-row action, allow users to set increment or decrement existing value.

What changed

• Introduce 2 new attributes to dropdown fields, isSearchable and subFields.customStyles
• if isSearchable is set to false, it prevent users from typing to search and center aligns the content (this is an existing prop that is unused)
• subFields.customStyles allows users to override the container of the subfields in multirow-multicol fields

Why

This frontend change will allow users to change the way the value is modified, either set-as, add by or subtract by.

[pregnantboy]

• PLU-309: [TILES-ATOMIC-INCREMENT-4] backend implementation for increment/decrement row value #835
• PLU-309: [TILES-ATOMIC-INCREMENT-3] enhance multirow-multicol UI with custom styles and operators #819 👈 (View in Graphite)
• PLU-818: [TILES-ATOMIC-INCREMENT-2] use .data() to automically update nested objects #818
• PLU-817: [TILES-ATOMIC-INCREMENT-1] allowing copying of row id in tiles #817
• develop-v2

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[datadog-opengovsg]

Datadog Report

Branch report: fix/tiles/update-operator
Commit report: b973dac
Test service: plumber

✅ 0 Failed, 732 Passed, 0 Skipped, 2m 14.28s Total Time
⬆️ Test Sessions change in coverage: 1 increased (+0.04%)

[pregnantboy]

FYI to reviewers, this PR does not include backend changes (i.e. setting the operator to any value will still result in a "set as" operation)

[linear]

PLU-309 Tiles: Increment counter action