Watch schema files

[joshribakoff-sm]

Is your feature request related to a problem? Please describe.
I have to reload my editor window everytime I edit the schema. Eg.

query {
 me: User
}

type User {
  id: String!
}

now edit to this:

query {
 me: User2
}

type User2 {
  id: String!
}

Gives:

Type "User2" is unreachableeslint@graphql-eslint/no-unreachable-types

Once the user reloads vscode, eslint restarts and your plugin rereads the schema and the stale error is fixed. This is annoying.

Describe the solution you'd like
If eslint is running in watch mode, watch the underlying schema files and reload them. Reload the schema files every-time the rule in invoked if necessary.

[dimaMachina]

duplicate #593