[Feature] enforce boundaries should register inputs to watch boundary config

[Tungsten78]

Similar to eslint executor which inserts into nx.json's targetDefaults

    "@nx/linter:eslint": {
      "inputs": ["default", "{workspaceRoot}/.eslintrc.json"]
    },

Workaround is to add a target default for @nx-dotnet/core:build.

    "@nx-dotnet/core:build": {
      "inputs": ["default", "{workspaceRoot}/.eslintrc.json"]
    },

Note: enfore-module-boundaries.js will also include .nx-dotnet.rc.json, not sure if this impacts the cache check or not.

As a related aside, is there a reason enforce boundaries is attached to the build executor and not lint?