Add a simple integration test

[artfuldev]

In this PR, we add a simple integration test.

The test downloads bitcoind, starts spaced to run against that, and calls space-cli which connects to the running instance of spaced. We assert on the space-cli outputs. We expose fields in Rpc structs in order to enable assertions.

We also:

• add an editorconfig file
• add a workflow that runs the integration tests on github actions
• add debug configurations for VS Code
• add some words to the dictionary for VS Code
• fix some (markdown)lint errors in the README
• update the test_fetcher unit test to use testnet4

[artfuldev]

Thanks this should be a good start! Are you able to activate and test the Github actions directly in your fork seems like it should be possible?

Thanks, I'm not sure what issue I had but I was able to run it on my fork, here's a sample run: https://github.com/artfuldev/spaced/actions/runs/10799001395/job/29953748697

[buffrr]

Thanks lgtm! I have squashed these logs as they're trivial and would otherwise add noise to the history.