fix(query): bns schemas, exports

[kyranjamie]

@alter-eggo tests were failing even though functionality worked because our mocked responses didn't conform to schema.

This PR exports all schemas as validators. When declaring mocks, let's do so with a schema.parse(mock), so we can verify they match.

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 6 lines in your changes missing coverage. Please review.

Project coverage is 23.81%. Comparing base (6b72065) to head (53075a9).

Files with missing lines	Patch %	Lines
packages/query/src/stacks/bns/bns.schemas.ts	0.00%	4 Missing ⚠️
packages/query/index.ts	0.00%	1 Missing ⚠️
packages/query/src/stacks/bns/bns-v2-client.ts	0.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##              dev     #618      +/-   ##
==========================================
- Coverage   23.84%   23.81%   -0.03%     
==========================================
  Files         165      165              
  Lines        6148     6151       +3     
  Branches      335      335              
==========================================
- Hits         1466     1465       -1     
- Misses       4682     4686       +4     

Files with missing lines	Coverage Δ
packages/query/src/query-prefixes.ts	100.00% <ø> (ø)
packages/query/index.ts	0.00% <0.00%> (ø)
packages/query/src/stacks/bns/bns-v2-client.ts	0.00% <0.00%> (ø)
packages/query/src/stacks/bns/bns.schemas.ts	0.00% <0.00%> (ø)

Components	Coverage Δ
bitcoin	62.04% <ø> (ø)
query	12.73% <0.00%> (-0.04%)	⬇️
utils	48.31% <ø> (ø)
crypto	68.21% <ø> (ø)
stacks	54.71% <ø> (ø)