Add SSL_CTX_set_ec_point_formats() and SSL_set_ec_point_formats()

Add SSL_CTX_set_ec_point_formats() and SSL_set_ec_point_formats()

The internal fields and implementation for configuration of this
parameter already existed, but was not exposed. This change adds simple
setters to allow configuration of this field.

Reviewed-by: Tomas Mraz <tomas@openssl.org>
Reviewed-by: Matt Caswell <matt@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/26990)