add Pluggable service provider interfaces (SPI) and default implementations

[baha-ai]

Aries Framework should support pluggable services provider interfaces for Crypto/KMS operations as per the Hyperledger wiki (Phase 1) design

The following are action items needed to implement this design

• [x] Add Common/Crypto service SPI #983

• [x] Add Crypto SPI (using Tink API) and its default implementation #984

• [x] Add KMS and SecretLock APIs and their default local implementations #985

  • [x] Rename existing KMS service to LegacyKMS in framework context #1144
  • [x] Add SecretLock API and mock #1145
  • [x] Add default SecretLock implementation #1146
  • [x] Create a new Storage type with Delete() function #1147
  • [x] Add a new KMS API and mock #1148
  • [x] Add a default (local) KMS implementation with Storage and SecretLock as providers #1149
  • [x] Hook the new KMS in framework and context #1150
  • [x] Update Crypto unit tests to load a KMS with the new key formats #1151

• Add Default implementation for JWE Authcrypt #986 (will be done separately)

• [x] Add Default implementation for JWE Anoncrypt #987

  • [x] Create new Key types to support ECDH-ES primitives (using NIST approved keys) #1469
  • [x] Replace HKDF with ConcatKDF in new ECDH-ES Tink primitive #1472
  • [x] Update created Tink Key types to return JWE components from crypto primitives #1470

• [x] Add Local Storage implementation of KMS SPI #994

• [x] Create (Keys) Storage Provider interface and implementations #995

• [x] Create Secret Lock provider #996

[llorllale]

All tasks completed:

• Crypto: https://github.com/hyperledger/aries-framework-go/tree/master/pkg/crypto
• KMS: https://github.com/hyperledger/aries-framework-go/tree/master/pkg/kms (with legacykms sub package soon to be deprecated)
• JWE: https://github.com/hyperledger/aries-framework-go/tree/master/pkg/doc/jose (jwe files to for building JWE messages)