REST query /gov/proposals does not support pagination.

[jnaviask]

Summary of Bug

The /gov/proposals query is still using an older form of parsing limit and page arguments, as seen in this function: https://github.com/cosmos/cosmos-sdk/blob/v0.37.3/x/gov/client/rest/rest.go#L558. As a result, pagination does not work as expected.

Version

1a7f31f / current

Steps to Reproduce

Run a rest server and compare curl -G "http://<serverUrl>/gov/proposals?page=1&limit=3" with curl -G "http://<serverUrl>/gov/proposals?page=2&limit=3" -- the results will be the same.

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