[Flosch1006]

Closes #116

• Add exported getData(url, token, method = "GET", data = NULL, host) to send a request to any endpoint and return the flattened data of the response as a dataframe
• Endpoint paths are prefixed with host; full URLs are only accepted if they start with host, so the bearer token is never sent to another host
• Nested fields are flattened into camelCase columns (e.g. squadHome.id → squadHomeId), matching impectPy; arrays stay list columns and single objects become one row
• Returns an empty dataframe for responses without content (e.g. 204), errors on an empty data list as in impectPy
• .callAPI() / .callAPIlimited() gain method and body arguments (default GET, body sent as JSON) so getData() reuses the same token bucket and retry logic; any 2xx status is accepted
• The token bucket is only created if the rate limit headers are valid
• Add roxygen docs with an example for an endpoint the package doesn't wrap, and a NEWS entry

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