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Add client certificate authentication support

Add client certificate authentication support: a task in LegoFlow-SWE (Harbor dataset). Currently, the HTTP client provides no way to supply a client certificate for TLS mutual authentication. Servers that require mTLS cannot be used. We need to add client certificate support to the client builder.

The task

Currently, the HTTP client provides no way to supply a client certificate for TLS mutual authentication. Servers that require mTLS cannot be used. We need to add client certificate support to the client builder.

Part of Lego-X/LegoFlow-SWE.