feat(diregapic)(LRO): Add minimum wrapper for mitigate future full-implementation diregapic LRO change

[summer-ji-eng]

Wrap an unary operations, that made it return a response compatible with the eventual LRO operation. In another word, utilize duck typing to return the similar structure, but no ".promise" field.

Sample code test on generated client library:

async function main() {
  const projectId = await regionOperationClient.getProjectId();
  const region = 'us-central1';
  const rand = Math.floor(Math.random() * 1000);
  const addressResource = {
    name: `operation-insert-address-test-${rand}`,
  };
  const [operation] = await addressClient.insert({
    addressResource: addressResource,
    project: projectId,
    region: region
  })
  console.log('insert address operation.id:: ', operation);
  }

The output:
insert address operation.id:: {
latestResponse: {
warnings: [],
id: '3894509470566436984',
_id: 'id',
startTime: '2021-08-29T22:37:27.644-07:00',
_startTime: 'startTime',
targetLink: 'https://www.googleapis.com/compute/v1/projects/gapic-images/regions/us-central1/addresses/operation-insert-address-test-188',
_targetLink: 'targetLink',
progress: 0,
_progress: 'progress',
region: 'https://www.googleapis.com/compute/v1/projects/gapic-images/regions/us-central1',
_region: 'region',
operationType: 'insert',
_operationType: 'operationType',
status: 'RUNNING',
_status: 'status',
...
},
done: false,
name: '3894509470566436984',
metadata: null,
result: {}
}

[alexander-fenster]

nit: there is no need to write booleanValue ? true : false, just booleanValue is enough. So you can just remove lines 180 and 181.

[summer-ji-eng]

I removed line 180 and 181, but update isDiregapic with the type boolean | '' | null | undefined

[alexander-fenster]

Looks good to me, let's just get rid of any :)

[alexander-fenster]

nit: no need to disable no-explicit-any now :)