fix: epochs infos missing start time

[cosmic-vagabond]

Description

What has Changed?

• init time value to current start time and start time fields of newly added epoch infos

---

Author Checklist

All items are required. Please add a note to the item if the item is not applicable and
please add links to any relevant follow up issues.

I have...

• included the correct type prefix in the PR title
• added ! to the type prefix if API or client breaking change
• targeted the correct branch (see PR Targeting)
• provided a link to the relevant issue or specification
• followed the guidelines for building modules
• included the necessary unit and integration tests
• included comments for documenting Go code
• updated the relevant documentation or specification
• reviewed "Files changed" and left comments if necessary
• confirmed all CI checks have passed

Reviewers Checklist

All items are required. Please add a note if the item is not applicable and please add
your handle next to the items reviewed if you only reviewed selected items.

I have...

• confirmed the correct type prefix in the PR title
• confirmed ! in the type prefix if API or client breaking change
• confirmed all author checklist items have been addressed
• reviewed state machine logic
• reviewed API design and naming
• reviewed documentation is accurate
• reviewed tests and test coverage
• manually tested (if applicable)

Deployment Notes

Are there any specific considerations to take into account when deploying these changes? This may include new dependencies, scripts that need to be executed, or any aspects that can only be evaluated in a deployed environment.

Screenshots and Videos

Please provide any relevant before and after screenshots by uploading them here. Additionally, demo videos can be highly beneficial in demonstrating the process.

[cosmic-vagabond]

successfully upgraded in localnet and tested:

$ elysd q epochs epoch-infos
epochs:
- current_epoch: "2054374"
  current_epoch_start_height: "6739296"
  current_epoch_start_time: "2024-04-01T10:35:49Z"
  duration: "15000000000"
  epoch_counting_started: true
  identifier: band_epoch
  start_time: "2023-04-10T18:42:34Z"
- current_epoch: "357"
  current_epoch_start_height: "6739275"
  current_epoch_start_time: "2024-03-31T18:42:34Z"
  duration: "86400000000000"
  epoch_counting_started: true
  identifier: day
  start_time: "2023-04-10T18:42:34Z"
- current_epoch: "1"
  current_epoch_start_height: "6739289"
  current_epoch_start_time: "2024-04-01T16:17:21.723045Z"
  duration: "14400000000000"
  epoch_counting_started: true
  identifier: fourhours
  start_time: "2024-04-01T16:17:21.723045Z"
- current_epoch: "1"
  current_epoch_start_height: "6739289"
  current_epoch_start_time: "2024-04-01T16:17:21.723047Z"
  duration: "1800000000000"
  epoch_counting_started: true
  identifier: halfhour
  start_time: "2024-04-01T16:17:21.723047Z"
- current_epoch: "8566"
  current_epoch_start_height: "6739280"
  current_epoch_start_time: "2024-04-01T15:42:34Z"
  duration: "3600000000000"
  epoch_counting_started: true
  identifier: hour
  start_time: "2023-04-10T18:42:34Z"
- current_epoch: "1"
  current_epoch_start_height: "6739289"
  current_epoch_start_time: "2024-04-01T16:17:21.72304Z"
  duration: "21600000000000"
  epoch_counting_started: true
  identifier: sixhours
  start_time: "2024-04-01T16:17:21.72304Z"
- current_epoch: "3081550"
  current_epoch_start_height: "6739296"
  current_epoch_start_time: "2024-04-01T10:34:04Z"
  duration: "10000000000"
  epoch_counting_started: true
  identifier: tenseconds
  start_time: "2023-04-10T18:42:34Z"
- current_epoch: "1"
  current_epoch_start_height: "6739289"
  current_epoch_start_time: "2024-04-01T16:17:21.723036Z"
  duration: "43200000000000"
  epoch_counting_started: true
  identifier: twelvehours
  start_time: "2024-04-01T16:17:21.723036Z"
- current_epoch: "1"
  current_epoch_start_height: "6739289"
  current_epoch_start_time: "2024-04-01T16:17:21.723046Z"
  duration: "7200000000000"
  epoch_counting_started: true
  identifier: twohours
  start_time: "2024-04-01T16:17:21.723046Z"
- current_epoch: "51"
  current_epoch_start_height: "6739275"
  current_epoch_start_time: "2024-03-25T18:42:34Z"
  duration: "604800000000000"
  epoch_counting_started: true
  identifier: week
  start_time: "2023-04-10T18:42:34Z"
pagination:
  total: "10"