feature: ngx_http_lua_ffi_ssl_get_client_hello_ext_present() #2414
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#2413
I hereby granted the copyright of the changes in this pull request
to the authors of this lua-nginx-module project.
This is a prerequisite to implementing https://github.com/fooinha/nginx-ssl-ja3 in Lua
openresty/lua-resty-core#496
Corresponding PR in lua-resty-core