[FEATURE] build package

Basically this shall execute buildTemplate followed by buildDefinitionBulk on selected components BUT adhering to what was set up in the config

sourceTargetMapping: https://github.com/Accenture/sfmc-devtools/blob/main/boilerplate%2Fconfig.json#L11

{
  "credentials": {
    "MyProject": {
      "businessUnits": {
        "DEV": "1235",
        "QA": "1236",
        "PROD": "1237"
      }
    }
  },
  "options": {
    "deployment": {
      "commitHistory": 10,
      "sourceTargetMapping": {
        "deployment-source": "deployment-target"
      }
    }
  },
  "markets": {
    "dev": {},
    "qa": {},
    "prod": {}
  },
  "marketList": {
    "deployment-source": {
      "description": "Define one 1:1 BU-Market combo here to as source for automated creation of deployment packages; you can create more than one source market list",
      "MyProject/DEV": "dev"
    },
    "deployment-target": {
      "description": "Define n BU-Market combo here to as target for automated creation of deployment packages; you can create more than one target market list and they can be as complex as you like",
      "MyProject/QA": "qa",
      "MyProject/PROD": "prod"
    }
  }
}