node: Support passing Private Key and Cert Chain to https.Agent in http request

[nana4gonta]

What does this PR do?

fixed: #16546

new https.Agent({}) now supports passing a Private Key (key) and Cert Chain (cert).

The ca.{crt,csr,key,srl}, {client, server}.{crt, csr, key} added to test/js/node/http/fixtures were generated using the following commands.

openssl genpkey -algorithm RSA -out ca.key
openssl req -new -key ca.key -out ca.csr -subj "/CN=root"
openssl x509 -req -days 36500 -in ca.csr -out ca.crt -signkey ca.key
echo "subjectAltName=DNS:localhost,IP:127.0.0.1" > san.txt

openssl genpkey -algorithm RSA -out client.key
openssl req -new -key client.key -out client.csr -subj "/CN=client"
openssl x509 -req -days 3650 -in client.csr -CA ca.crt -CAkey ca.key -CAcreateserial -out client.crt -extfile san.txt

openssl genpkey -algorithm RSA -out server.key
openssl req -new -key server.key -out server.csr -subj "/CN=localhost"
openssl x509 -req -days 3650 -in server.csr -CA ca.crt -CAkey ca.key -CAcreateserial -out server.crt -extfile san.txt 

• [ ] Documentation or TypeScript types (it's okay to leave the rest blank in this case)
• Code changes

How did you verify your code works?

• I included a test for the new code, or existing tests cover it
• I ran my tests locally and they pass (bun-debug test test-file-name.test)