feat: encode CPA response when csm alpha feature is enabled [TOL-2080]

[2wce]

Summary

This should make it easier for customers to set up Content Source Maps. Once this is merged, enabling the CSM alpha feature will encode the CPA response directly reducing the steps needed to set this up

Description

We have added a wrapper function the conditionally encodes the CPA response depending on whether the alpha feature is enabled or not

Todos

• rename the alpha feature from withContentSourceMaps to includeContentSourceMaps
• it should encode the CPA response directly (encodeCPAResponse)
• it loads the content source maps in the background
• Import it from the content-source-maps package (smaller bundlesize than live preview SDK)

NOTE:
We haven't added tests for the entry endpoint because the test entry in the space uses unsupported fields & we have realised that we currently encode them in the csm package anyway so we would have to finish the work on supporting them first before adding tests here to confirm if they work

[z0al]

LGTM but I'm missing tests for the new behavior.

[mgoudy91]

looks good to me, no concerns

[contentful-automation]

🎉 This PR is included in version 10.11.0 🎉

The release is available on:

• npm package (@latest dist-tag)
• GitHub release

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