Part of #930

This PR contains changes with respect to the generalized DA specification. This is the first part of the implementation.

Changelog:

• Added interchain to the da registry [1]
• Added DAClientV2 interface [2]
• Added BatchRetrieverV2 [3]
• Added V2 for ResultRetrieveBatch [4], ResultSubmitBatch [5]
• Added da.Path [6]
• Added the interchain DA client [7]
• Interchain DA client config and tests [8]
• Init for the interchain DA client [9]
• SubmitBatchV2 for the interchain DA client [10]

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 <-- is not needed in this PR
• All CI checks have passed
• Added relevant godoc comments

For Reviewer:

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

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.