feat: Adds showScrollbarOnlyOnHover functionality as a property to ScrollIndicator

[souma-ghosh]

Description

Fixes # (issue)

Please delete options that are not relevant.

• New feature (non-breaking change which adds functionality)

How Has This Been Tested?

• Manually tested

Checklist:

• My code follows the style guidelines of this project
• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• My changes generate no new warnings
• I have added tests that prove my fix is effective or that my feature works
• New and existing unit tests pass locally with my changes

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Name	Status	Preview	Updated
design-system	✅ Ready (Inspect)	Visit Preview	Aug 17, 2022 at 1:06PM (UTC)

[changeset-bot]

🦋 Changeset detected

Latest commit: acea1df

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 1 package

Name	Type
@appsmithorg/design-system	Patch

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