Creates a preconfigured httr2 client to call Evolution API v2.
It sets the apikey header, a custom User-Agent and basic automatic retries.
The returned object is used by every send_*() function and stores the base
request (req) and the instance name so you don't have to repeat them.
Examples
if (FALSE) { # \dontrun{
client <- evo_client(
base_url = "https://your-evolution-host.com",
api_key = Sys.getenv("EVO_APIKEY"),
instance = "myInstance"
)
} # }
