clang-tidy: sync argument names in prototype and definition

Discovered with clang-tidy checker
`readability-inconsistent-declaration-parameter-name`.

Also:
- do not enforce the above because of inconsistencies still present
  between public API prototypes and definitions. (Also betwen man page
  protos, and man page examples, and other parts of the code, e.g.
  `easy` vs `curl` vs `d` vs `handle`) Perhaps subject for a future
  effort:
  https://github.com/curl/curl/actions/runs/22166472728/job/64094691653
- enable and fix `readability-named-parameter` where missing.

Refs:
https://clang.llvm.org/extra/clang-tidy/checks/readability/inconsistent-declaration-parameter-name.html
https://clang.llvm.org/extra/clang-tidy/checks/readability/named-parameter.html

Closes #20624

lib/ws.c

@@ -622,7 +622,7 @@ static CURLcode ws_enc_send(struct Curl_easy *data,
                             size_t buflen,
                             curl_off_t fragsize,
                             unsigned int flags,
-                            size_t *sent);
+                            size_t *pnsent);
 static CURLcode ws_enc_add_pending(struct Curl_easy *data,
                                    struct websocket *ws);