Use various providers in JCA

[hugoqnc]

JCA uses a provider-based architecture, where one can specify a cryptography provider (like BouncyCastle) which will provide the implementations of JCA APIs.

• Investigate if we can often identify the provider when tracking JCA crypto calls
• If so, restructure the JCA rules to make them depend on the provider
• Add BouncyCastle as a cryptography provider for JCA