feat: fragment block for crosswalk

[buuhuu]

Please always provide the GitHub issue(s) your PR is for, as well as test URLs where your change can be observed (before and after):

Fix #

Test URLs:

• Before: https://main--aem-boilerplate-xwalk--adobe-rnd.hlx.live/drafts/drudolph/fragments
• After: https://fragment--aem-boilerplate-xwalk--adobe-rnd.hlx.live/drafts/drudolph/fragments

[aem-code-sync[bot]]

Hello, I'm the AEM Code Sync Bot and I will run some actions to deploy your branch and validate page speed. In case there are problems, just click a checkbox below to rerun the respective action.

• [ ] Re-run PSI checks
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Commits

* [cae81cd](https://github.com/adobe-rnd/aem-boilerplate-xwalk/commit/cae81cd59de2648d90ca506a9124b1ce88fdb29b) :white_check_mark: (latest) * [8b28b20](https://github.com/adobe-rnd/aem-boilerplate-xwalk/commit/8b28b20fc345f2591e4582380175f860a0fad0c4) :white_check_mark: * [a8937d0](https://github.com/adobe-rnd/aem-boilerplate-xwalk/commit/a8937d044c09cbd3f459dcba0efce200248c222e) :white_check_mark:

[aem-code-sync[bot]]

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