feat: serde rename batch index into masp tx index

[mateuszjasiuk]

Describe your changes

Checklist before merging

• If this PR has some consensus breaking changes, I added the corresponding breaking:: labels
  • This will require 2 reviewers to approve the changes
• If this PR requires changes to the docs or specs, a corresponding PR is opened in the namada-docs repo
  • Relevant PR if applies:
• If this PR affects services such as namada-indexer or namada-masp-indexer, a corresponding PR is opened in that repo
  • Relevant PR if applies:

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 73.03%. Comparing base (36ca7c3) to head (4093f0b).
Report is 43 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #3860      +/-   ##
==========================================
- Coverage   73.04%   73.03%   -0.01%     
==========================================
  Files         340      340              
  Lines      104816   104816              
==========================================
- Hits        76559    76552       -7     
- Misses      28257    28264       +7     

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.

[mergify]

Hey @mateuszjasiuk, your pull request has been dequeued due to the following reason: CHECKS_FAILED.
Sorry about that, but you can requeue the PR by using @mergifyio requeue if you think this was a mistake.

[tzemanovic]

@Mergifyio requeue

[mergify]

requeue

✅ The queue state of this pull request has been cleaned. It can be re-embarked automatically

[mergify]

Hey @mateuszjasiuk, your pull request has been dequeued due to the following reason: CHECKS_FAILED.
Sorry about that, but you can requeue the PR by using @mergifyio requeue if you think this was a mistake.

[tzemanovic]

it looks like this a breaking change for IBC (possibly in hermes) as it keeps failing in ibc_upgrade_client