feat: Added flex component

[albinAppsmith]

Description

This PR addes the Flex component.

Fixes appsmithorg/appsmith#27607
Fixes appsmithorg/appsmith#27608
Fixes appsmithorg/appsmith#27606

Type of change

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

How Has This Been Tested?

• Manual on storybook
• Manual on main repo
• Jest
• Cypress

Test Plan

Add Testsmith test cases links that relate to this PR

Issues raised during DP testing

Link issues raised during DP testing for better visiblity and tracking (copy link from comments dropped on this PR)

Checklist:

Dev activity

• 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

QA activity:

• Test plan has been approved by relevant developers
• Test plan has been peer reviewed by QA
• Cypress test cases have been added and approved by either SDET or manual QA
• Organized project review call with relevant stakeholders after Round 1/2 of QA
• Added Test Plan Approved label after reveiwing all Cypress test

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Latest commit: 4b554c2

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Name	Type
@appsmithorg/design-system	Patch

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Name	Status	Preview	Comments	Updated (UTC)
design-system	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Oct 13, 2023 10:56am

[KelvinOm]

@albinAppsmith what is the difference between Flex and #644 components and what is the reason to have both of them?

[albinAppsmith]

@albinAppsmith what is the difference between Flex and #644 components and what is the reason to have both of them?

@KelvinOm I have made the box component as private and not export it outside the package. And for grid and flex I'm using it.

[KelvinOm]

LGTM. @jsartisan Could you also take a look?