Add ECDSA support for importing private key from PEM

Improvements and bug fixes

• Various smaller bug fixes.
• Set corresponding security signature hash and validate ECDSA security signature hash algorithm length for ECC certificates
• Fix: Return full CertificateChain after Certificate Update
• Add ECDSA support for importing private key from PEM
• Allow Subject Name Change of Application Certificate in GDS Push scenario
• Extend ServerConfiguration & GDS Server for ECC
• Simplify SetECDsaPublicKey and padd with leading zeros.

ECC support

• Changes to applications configuration
• Configuration permits specifying multiple application certificate types details
• Backward compatibility with existing configurations - meaning no ECC just RSA encryption support

What's Changed

• Set initial value of LastActiveTickCount by @mrsuciu in #2953
• Bump Microsoft.Extensions.Configuration from 9.0.0 to 9.0.1 by @dependabot in #2956
• Revert "merge main374 into current branch by @mrsuciu in #2958
• Merge develop/main347 to master by @mrsuciu in #2959
• Update version.json to 1.5.375 by @mrsuciu in #2960
• Simplify SetECDsaPublicKey and padd with leading zeros by @mrsuciu in #2963
• CustomNodeManager2 initialize predefined nodes in constructor by @romanett in #2966
• Cherry-pick initialize predefined nodes in constructor from master by @mrsuciu in #2968
• Set default value for NonceLength to 32 by @mrsuciu in #2971
• Update version.json by @mrsuciu in #2972
• Correct identity token encryption by setting the correct security policy for the user token by @mrsuciu in #2976
• Update version.json by @mrsuciu in #2977