enable JKS certificate format in opentelemetry sdk autoconfigure

Hi,

When using the java library we can set our jks certificates with following method:

KeyStore ks = KeyStore.getInstance("JKS");
ks.load(getResourceAsInputStream(tlsKeyStore), tlsKeyStorePassword.toCharArray());

KeyStore ts = KeyStore.getInstance("JKS");
ts.load(getResourceAsInputStream(tlsTruststore), tlsTrustStorePassword.toCharArray());

builder.setEndpoint(String.format(ENDPOINT_FORMAT, agentHost, agentPort))
            .setTimeout(timeout, TimeUnit.SECONDS)
            .setClientTls(ks.getKey("private-key", tlsKeyPassword.toCharArray()).getEncoded(), ks.getCertificate("cert-chain").getEncoded())
            .setTrustedCertificates(ts.getCertificate("collector-cert").getEncoded())
            .build();

Can we make it possible to do this with the autoconfigure as well?
Right now I'm using PEM format certificates, which works (OTEL_EXPORTER_OTLP_CERTIFICATE / OTEL_EXPORTER_OTLP_TRACES_CERTIFICATE) but in the future we need to use JKS files.

Thanks

No files or tests are named. Start by locating the autoconfigure handling for the existing PEM environment variables and compare it with the JKS KeyStore usage shown in the issue. Done means JKS keystore and truststore files can be configured through autoconfigure for the relevant TLS settings, while existing PEM configuration continues to work.