feat(rpc): add kvstore fixtures for v1

[melekes]

This pull request introduces a new set of fixtures for version v1 in the kvstore test suite, adding comprehensive test data for various RPC interactions, such as querying keys, fetching blocks by height or hash, and retrieving block results. These changes enhance the test coverage for the v1 version of the kvstore module.

[Copilot]

Pull Request Overview

This PR introduces v1 fixtures for the kvstore RPC tests and updates the dockerized probe to target CometBFT v1.0.0.

• Updated tools/rpc-probe docs and Makefile to use CometBFT v1.0.0 and corrected RPC links.
• Added comprehensive outgoing/incoming JSON fixtures under rpc/tests/kvstore_fixtures/v1.
• Noted placeholder (empty) incoming subscribe_newblock.json.

Reviewed Changes

Copilot reviewed 74 out of 74 changed files in this pull request and generated no comments.

File	Description
tools/rpc-probe/README.md	Adjusted Docker image tag and RPC docs URL
tools/rpc-probe/Makefile.toml	Updated DOCKER_IMAGE to cometbft/cometbft:v1.0.0
rpc/tests/kvstore_fixtures/v1/incoming/subscribe_newblock.json	Empty placeholder fixture; likely needs actual payload

Comments suppressed due to low confidence (2)

tools/rpc-probe/README.md:37

• The example image tag here (v0.37.x) conflicts with the Makefile default (v1.0.0). Consider updating this line to use cometbft/cometbft:v1.0.0 for consistency.

cargo make --env DOCKER_IMAGE="cometbft/cometbft:v0.37.x"

rpc/tests/kvstore_fixtures/v1/incoming/subscribe_newblock.json:1

• This incoming fixture is empty ({}) but all numbered variants include full event data. If tests rely on subscribe_newblock responses, populate this file with at least the minimal expected JSON structure.

{}