chore: add HTTP utility and export in browser and react packages

[brionmario]

Purpose

This pull request introduces a new HTTP utility to the @asgardeo/browser package and makes it available for use in the React package. The main focus is to simplify HTTP requests by exposing a convenient API for single and multiple requests using the existing authentication client.

New HTTP utility integration:

• Added a new http utility in packages/browser/src/utils/http.ts, providing request and requestAll methods that wrap the AsgardeoSPAClient's HTTP functionality.
• Exported the new http utility from packages/browser/src/index.ts for external use.

React package API updates:

• Re-exported the http utility from @asgardeo/browser in packages/react/src/index.ts, making it available to React consumers.

Related Issues

• chore: expose http as a JS module #128

Related PRs

• N/A

Checklist

• e2e cypress tests locally verified.
• Manual test round performed and verified.
• UX/UI review done on the final implementation.
• Documentation provided. (Add links if there are any)
• Unit tests provided. (Add links if there are any)
• Integration tests provided. (Add links if there are any)

Security checks

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