patch to handle v1 chains that return nextKey as string

[mhagel]

Link to Issue

Closes: #6609

Description of Changes

• makes sure paginated proposal types load properly for UX (a gov v1 chain)

"How We Fixed It"

• If pagination.next_key is a string, this converts it to the expected uint8array

Test Plan

• CA (click around) tested on local and frack:
  • http://localhost:8080/ux/proposals
  • expect over 140 proposals to load.

Deployment Plan

Other Considerations

[timolegros]

Hey, just noting that this may need to be updated for the cosmos notification generator as well as I believe it uses the same or similar logic.

[mhagel]

Hey, just noting that this may need to be updated for the cosmos notification generator as well as I believe it uses the same or similar logic.

thanks. done.

[ianrowan]

LGTM