Upgrade to latest antv/x6 drawing package

[jgadsden]

Describe what problem your feature request solves:
we have a lot of niggles with the drawing package, and this may be because we are using an old version :

    "@antv/x6": "^1.32.7",
    "@antv/x6-vue-shape": "^1.4.0",

Describe the solution you'd like:
upgrade to latest version 2.x - note that this is a breaking change:

    "@antv/x6": "^2.18.1",
    "@antv/x6-vue-shape": "^2.1.2",
    "@antv/x6-plugin-history": "^2.2.4",
    "@antv/x6-plugin-clipboard": "^2.1.6",
    "@antv/x6-plugin-keyboard": "^2.2.13",
    "@antv/x6-plugin-scroller": "^2.0.10",
    "@antv/x6-plugin-selection": "^2.2.2",
    "@antv/x6-plugin-snapline": "^2.1.7",
    "@antv/x6-plugin-stencil": "^2.1.5",
    "@antv/x6-plugin-transform": "^2.1.8",

Additional context:

[jgadsden]

use of @antv/x6-vue-shape v2.x
migration for @antv/x6 v2.x

[jgadsden]

This may solve issue #1041 , which is blocking the release of version 2.3

[jgadsden]

closed by pull request 'Migrate to version 2.x antv/x6' #1099
a mammoth effort from @lreading and @jgadsden which contains 34 commits