chore: add Español - es-ES language support

[SherlynS]

Purpose

Previously, the Asgardeo JavaScript SDK did not have support for Spanish (Español - es-ES). Users who prefered Spanish would not have been able see UI components translated, limiting accessibility for Spanish-speaking users.

This PR addresses this barrier and now customers who prefer Spanish will be able to see UI components translated and easily navigate through other UI components for each readability and use.

Related PRs/Issues

• PR: 157

Changes

• Added new es-ES.ts file for Spanish translation
• Added to index.ts the export value to make Spanish translations importable across SDK
• Added spanish-translation-bundle.md changeset to trigger a minor @asgardeo/i18n version bump
• Modified CONTRIBUTING.md doc to showcase documentation caveats encountered in building and testing.

Testing

• Followed option 2: testing with sample in order to verify changes

Checklist

• Followed the CONTRIBUTING guidelines.
• Manual test round performed and verified.
• Documentation provided. - updated exiting documentation
• no unit tests - only sample testing

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?

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