feat: allow to change clipboard fragment format name

[ilya2204]

Description
Allow customization of clipboard fragment format name. Based on #5233 and slate-angular

Issue
#5233

Checks

• The new code matches the existing patterns and styles.
• The tests pass with yarn test.
• The linter passes with yarn lint. (Fix errors with yarn fix.)
• The relevant examples still work. (Run examples with yarn start.)
• You've added a changeset if changing functionality. (Add one with yarn changeset add.)

[changeset-bot]

🦋 Changeset detected

Latest commit: 37d6475

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 1 package

Name	Type
slate-react	Minor

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[dylans]

Thanks @ilya2204 ! Could you please add a changeset and then I'll land this?

[ilya2204]

@dylans I added changeset)

[dylans]

For some reason this is failing our integration tests. I'm going to try to run it again later today.

[ilya2204]

@dylans seems to pass all tests

[dylans]

@ilya2204 yes, we landed a PR a couple of days ago which fixed the failing tests. Thanks for reminding me!