Expose client certificate handling.

[back2dos]

Some option is needed to allow e.g. self signed certificates in fetch or at least in NodeClient, otherwise it's pretty hard to do HTTPS with localhost.

[kevinresol]

One can now provide a custom Agent to NodeClient, does that fit your need?

tink_http/src/tink/http/clients/NodeClient.hx

Line 24 in fdbd88c

public function new(?agent) {