Add support for client certificate authentication

[petkivim]

Client certificate authentication is a mutual certificate based authentication, where the client provides its client certificate to the server to prove its identity. Client certificate is a digital certificate which confirms to the X.509 specification.

Some REST APIs and SOAP web services require client certificate authentication. Therefore, it should be possible to upload a client certificate to Budibase and enable it for specific integrations. In this way, Budibase will use the client certificate when establishing a connection to integrations as a client. Also, different integrations should support using different client certificates.

A client certificate is usually protected with a password and loaded onto a client application (usually as PKCS12 files with the .p12, .pfx, .pem extension).

[linear]

BUDI-9002 Add support for client certificate authentication