Rename 'colors' to 'palette' in FlowMetaThemeColorScheme for AsgardeoV2 (Thunder)

[brionmario]

Purpose

We need to update the SDK to match the new Theme API response of Thunder.

Related Issues

• feat: provide initial provision for asgardeo/thunder runtime #212
• Introduce a /design endpoint to replace /branding endpoint thunder#1274

Related PRs

• N/A

Checklist

• Followed the CONTRIBUTING guidelines.
• Manual test round performed and verified.
• Documentation provided. (Add links if there are any)
• Unit tests provided. (Add links if there are any)

Security checks

• Followed secure coding standards in http://wso2.com/technical-reports/wso2-secure-engineering-guidelines?
• Confirmed that this PR doesn't commit any keys, passwords, tokens, usernames, or other secrets?

[asgardeo-github-bot]

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