Bug report: GovClient.Proposals() doesn't properly parse request

[dylanschultzie]

Prerequisites

• I am running the latest CosmPy version.
• I checked the documentation and found no answer to my problem.
• I checked the existing issues to make sure my problem has not already been reported.
• I have read the code of conduct before creating this issue.

Expected Behavior

Presumably proposals should be returned that fit the given status: https://github.com/fetchai/cosmpy/blob/main/tests/unit/test_gov/test_rest_client.py#L93

Current Behavior

Response: 400, b'{\n  "code": 3,\n  "message": "type mismatch, parameter: proposal_id, error: strconv.ParseUint: parsing \\"\\": invalid syntax",\n  "details": [\n  ]\n}')

To Reproduce

from cosmpy.common.rest_client import RestClient
from cosmpy.gov.rest_client import GovRestClient
from cosmpy.protos.cosmos.gov.v1beta1.query_pb2 import QueryProposalsRequest

gov_client = GovRestClient(RestClient(f"https://rest-fetchhub.fetch.ai"))    
request = QueryProposalsRequest()
request.proposal_status = 2
response = gov_client.Proposals(request)

Context

Cosmpy: v0.8.0
Python: v3.11

Failure Logs

No response