Forcing consistent type imports

[aaroncox]

I added a new eslint rule and modified the mock contracts to follow this rule. We need to update the code generator to follow this rule, either by implementing a linter that automatically fixes the output code or by modifying the code generator to understand when it needs to import as a type.

I tried to solve this by including and programmatically using eslint, which does in fact work, but only in dev mode.

I couldn't figure out how to get the eslint API working after you build the cli app and then ran it externally. The rollup bundle didn't include the plugins (like @typescript-eslint/eslint-plugin) and would result in errors like:

An error occurred while generating the contract code: Error: Failed to load plugin '@typescript-eslint' declared in 'CLIOptions': Cannot find module '@typescript-eslint/eslint-plugin'
Require stack:
- /Users/aaron/projects/wharfkit/example-svelte-ts/__placeholder__.js
Referenced from: CLIOptions
node:internal/modules/cjs/loader:995
  const err = new Error(message);
              ^

Error: Failed to load plugin '@typescript-eslint' declared in 'CLIOptions': Cannot find module '@typescript-eslint/eslint-plugin'
Require stack:
- /Users/aaron/projects/wharfkit/example-svelte-ts/__placeholder__.js
Referenced from: CLIOptions
    at Module._resolveFilename (node:internal/modules/cjs/loader:995:15)
    at Function.resolve (node:internal/modules/cjs/helpers:109:19)
    at Object.resolve (/Users/aaron/projects/wharfkit/cli/node_modules/@eslint/eslintrc/dist/eslintrc.cjs:2337:46)
    at ConfigArrayFactory._loadPlugin (/Users/aaron/projects/wharfkit/cli/node_modules/@eslint/eslintrc/dist/eslintrc.cjs:3404:33)
    at ConfigArrayFactory._loadExtendedPluginConfig (/Users/aaron/projects/wharfkit/cli/node_modules/@eslint/eslintrc/dist/eslintrc.cjs:3224:29)
    at ConfigArrayFactory._loadExtends (/Users/aaron/projects/wharfkit/cli/node_modules/@eslint/eslintrc/dist/eslintrc.cjs:3145:29)
    at ConfigArrayFactory._normalizeObjectConfigDataBody (/Users/aaron/projects/wharfkit/cli/node_modules/@eslint/eslintrc/dist/eslintrc.cjs:3086:25)
    at _normalizeObjectConfigDataBody.next (<anonymous>)
    at ConfigArrayFactory._normalizeObjectConfigData (/Users/aaron/projects/wharfkit/cli/node_modules/@eslint/eslintrc/dist/eslintrc.cjs:3031:20)
    at _normalizeObjectConfigData.next (<anonymous>) {
  code: 'MODULE_NOT_FOUND',
  requireStack: [
    '/Users/aaron/projects/wharfkit/example-svelte-ts/__placeholder__.js'
  ],
  messageTemplate: 'plugin-missing',
  messageData: {
    pluginName: '@typescript-eslint/eslint-plugin',
    resolvePluginsRelativeTo: '/Users/aaron/projects/wharfkit/example-svelte-ts',
    importerName: 'CLIOptions'
  }
}