chore(rollapp): added x/rollapp proto files

[keruch]

PR Standards

Close #1078

Dymint imported the Hub previously, but now Cosmos versions are different as well as other deps, so direct import doesn't work currently. As a workaround, the autogenerated proto contracts were copied from the Hub to Dymint. Copying autogenerated files is not safe (it can lead to dependencies mismatch), it's impossible to find what was the original proto for these files, and it's extremely inobvious how to add new fields to such proto contracts (apparently find a suitable generator, generate files using it, and then manually copy them?).

This PR moves x/rollapp proto contracts from the Hub to Dymint, so the files are generated directly in the Dymint repo with its own proto generator.

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For Author:

• Targeted PR against correct branch
• included the correct type prefix in the PR title
• Linked to Github issue with discussion and accepted design
• Targets only one github issue
• Wrote unit and integration tests
• All CI checks have passed
• Added relevant godoc comments

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For Reviewer:

• confirmed the correct type prefix in the PR title
• Reviewers assigned
• confirmed all author checklist items have been addressed

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After reviewer approval:

• In case targets main branch, PR should be squashed and merged.
• In case PR targets a release branch, PR should be rebased.

[mtsitrin]

@keruch awesome!

can u do the same for the x/sequencer and get rid of the third_party/dymension/sequencer copied files?