Initial step to implementing support for invoke command

[jnjerin]

This PR fixes a few issues caused by npm and implements support for invoke command for the simplest use case in issue #390:

1. Fixes errors caused by npm when running tests:

   • Removes unsupported test library for fabric that depends on packages that fail to compile
   • Bumps nodejs version from 12 to 16 at samples/chaincodes/chaincode-kv-node/.nvmrc
   • Removes non-crucial tests from the sample chaincode
     Possible fix for:
     Chaincode Sample nvm version problem. #348
     Issue with NodeJS versioning #328

2. Created a new script chaincode-scripts.sh to handle docker exec

3. Created the invoke command for its simplest use case

4. Update CHANGELOG.md with the new changes

[dzikowski]

I think those two lines can be removed

[dzikowski]

Redundant log message

[dzikowski]

I think we should use a consistent convention, like the one we use for instance here:

chaincodePackage() {
  local CLI_NAME=$1
  local PEER_ADDRESS=$2
  local CHAINCODE_NAME=$3
  local CHAINCODE_VERSION=$4
  local CHAINCODE_LABEL="${CHAINCODE_NAME}_$CHAINCODE_VERSION"
  local CHAINCODE_LANG=$5

  echo "Packaging chaincode $CHAINCODE_NAME..."
  inputLog "CHAINCODE_VERSION: $CHAINCODE_VERSION"
  inputLog "CHAINCODE_LANG: $CHAINCODE_LANG"
  inputLog "PEER_ADDRESS: $PEER_ADDRESS"
  inputLog "CLI_NAME: $CLI_NAME"

So:

• snake case with capital letters for variable names
• and inputLog instead of echo