feat: Ability to pass in ssh2 client to transport

[abmusse]

Part of #315

Here is an example on how this could be used:

/** * Example using an existing ssh2 client with itoolkit's ssh transport */const{ Connection, CommandCall }=require('itoolkit');const{ Client }=require('ssh2');const{ parseString }=require('xml2js');constclient=newClient();// add ready listener// then call itoolkit after client is connected and readyclient.on('ready',()=>{constconnection=newConnection({transport: 'ssh',transportOptions: {sshClient: client,},});constcommand=newCommandCall({type: 'cl',command: 'RTVJOBA USRLIBL(?) SYSLIBL(?)'});connection.add(command);connection.run((error,xmlOutput)=>{if(error){throwerror;}parseString(xmlOutput,(parseError,result)=>{if(parseError){throwparseError;}console.log(JSON.stringify(result));});// user closes the connection as neededclient.end();client.destroy();});});client.connect({host: process.env.HOST,username: process.env.USER,password: process.env.PASS,});

[github-actions]

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