Export SQL database to a local file

[mkorsukov]

Related command
az sql db export

Is your feature request related to a problem? Please describe.
Need an ability to export database into a local bacpac file.

Describe the solution you'd like
An option to use the az sql db export command with local file support. For instance:

az sql db export \
  --resource-group "..." \
  --server "..." \
  --name "..." \
  --admin-user "..." \
  --admin-password "..." \
  --file "EXPORT_FILE.bacpac" \

Describe alternatives you've considered
Current alternative solution is to use the SqlPackage tool. For instance:

sqlpackage /a:Export /tf:"EXPORT_FILE.bacpac" /scs:"DATABASE_CONNECTION"

[yonzhan]

Thank you for opening this issue, we will look into it.