[OC] Downsize the webchat script hosted on CDN

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Feature Request

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Is your feature request related to a problem? Please describe.

Customer of Dynamics 365 Omnichannel reported that because webchat script is too large (~5MB full size), their Google Lighthouse score dropped and their website is ranked lower than before in Google search engine.

Other incidents report that failure to load webchat script

Describe the suggestion or request in detail

Decrease the size of said script (We're using webchat-es5.js for instance).

Describe alternatives you have considered

Provide different versions of webchat leaving certain features out as the customer sees fit (For example, OC doesn't need speech), so it might be beneficial to use a version that doesn't have speech modules

Additional context

[feature-request]

Start by reviewing the webchat-es5.js bundle and the reported Lighthouse and treemap context in this issue. Determine which features contribute to the bundle size and define a measurable reduction, such as a smaller build or versions without speech modules; the issue names no source files or tests.