feat(connector-fabric): identity json signing credentials hyperledger-cacti#1130

Introduces a new, optional (for now) parameter on the run tx
endpoint's request object called gatewayOptions which is capable
of including everything that one needs to instantiate a gateway
object of the underlying Fabric Node SDK.

This change makes it possible to not need the keychain plugin
at all when someone does not need/want it.

Fixes hyperledger-cacti#1130

Depends on hyperledger-cacti#1124

Signed-off-by: Peter Somogyvari <[email protected]>

Author: petermetz

examples/cactus-example-carbon-accounting-backend/package-lock.json

@@ -97,7 +97,7 @@
     "@openzeppelin/contracts": "3.3.0",
     "@openzeppelin/contracts-upgradeable": "3.4.1",
     "async-exit-hook": "2.0.1",
-    "fabric-network": "1.4.13",
+    "fabric-network": "2.2.8",
     "fs-extra": "9.1.0",
     "openapi-types": "7.0.1",
     "typescript-optional": "2.0.1",