feat(webex): add first-party authentication support for UMD bundle

[ursnj]

Summary

We use ESM based front end application with Webex CDN for Metrics and Device registration, Now we need to add authentication through Webex, But when we are trying to integrate same we are getting multiple issues with CJS and ESM support and @webex/plugin-authorization-browser-first-party plugin support with existing CDN.

We are not really sure about replacing exisitng auth with first party auth in main bundle and doing that may break existing users, So This PR adds a separate first-party Webex UMD/CDN bundle while preserving the existing webex.min.js bundle as is.

Changes

• Adds first-party Webex entrypoints under packages/webex/src/.
• Registers a UMD-only webex-first-party webpack entry.
• Adds @webex/plugin-authorization-browser-first-party as a webex workspace dependency.
• Includes generated umd/webex-first-party.min.js and source map for npm/CDN publishing.

Validation

• yarn install --immutable
• yarn workspace webex build:src
• yarn workspace webex test:style
• yarn run build:script
• yarn workspace webex pack --dry-run

test:style passed with existing warnings and no errors. The package dry-run includes umd/webex-first-party.min.js and umd/webex-first-party.min.js.map.

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