feat: 2207 - sales forecast

Remarks:

(1) developers will need to put the forecast template located in api/app_templates in their local minio bucket (inside a folder named "templates", which is possibly inside a folder named "docs" (depending on what they've set as their "MINIO_PREFIX")).

(2) the frontend will be able to download the forecast template by doing:

axios.get('/forecasts/template_url').then((response) => {
  const url = response.data.url
  download(url, {headers: {Authorization: null}})
})

where download is in src/app/utilities/download.js

bcgov / zeva

feat: 2207 - sales forecast #2211

Quality Gate passed