Add getData() for arbitrary endpoints #116

Summary

Add getData() for arbitrary endpoints

Motivation

impectPy has getData(url, token, method="GET", data=None). It sends a rate-limited request to any endpoint (a relative path is prefixed with the host) and returns the flattened response as a dataframe. impectR has no public equivalent, so users can't reach endpoints the package doesn't wrap without writing their own httr code and rate limiting.

Proposed Solution

• Exported getData(url, token, method = "GET", data = NULL, host = "https://api.impect.com").
• Reuse the existing .callAPIlimited() (token bucket + retry) so it respects the same rate limits.
• Flatten $data with jsonlite::flatten() / .cleanData() so the output matches impectPy's flattened dataframe.
• Add roxygen docs with an example that calls an endpoint the package doesn't wrap.

Alternatives Considered

No response

Additional Context

Parity with impectPy.