Add more options to run JCLCheck command

[JWaters02]

The problem

Currently having the commands restricted to command palette is not as good as it could be because VS Code is still a completely new environment for most mainframers who have used 3270 for years and some feedback I've had from some of them is that the command palette is a confusing list of options and they always forget how to open it.

Suggestions

It would be nice to have an option in the right click context menu in an open file to run the Check JCL command. Something like

"editor/context": [
  {
    "when": "editorFocus",
    "command": "jcl-check-support.checkJcl",
    "group": "someapplicablegroup"
  }
]

Perhaps also if the user is using Zowe Explorer, adds a right click item to the tree views. It would also need to make sure the file is open first. Something like

"view/item/context": [
  {
    "when": "view == zowe.ds.explorer && viewItem =~ /^(ds.*|^member.*)/ && !listMultiSelection",
    "command": "jcl-check-support.checkJcl",
    "group": "000_zowe_dsMainframeInteraction@6"
  }
]

and perhaps also one for E4E? I think it would be this

"view/item/context": [
  {
    "when": "!listMultiSelection && viewItem =~ /^ELEMENT_IN_PLACE/ || !listMultiSelection && viewItem =~ /^ELEMENT_UP_THE_MAP/",
    "command": "jcl-check-support.checkJcl",
    "group": "2_e4e_edit_element_actions@2"
  }
]

As for generate report, I think that one could stay in command palette as I don't see it getting as much usage as the check stuff.