Docs for new feature: autogenerate component imports at build time

[willtsai]

What content needs to be created or modified? Documentation needs to be created for the new feature "Autogenerate component imports at build time" planned for release v1.6

Describe the solution you'd like Author Dapr Documentation for "Autogenerate component imports at build time" feature, as described in https://github.com/dapr/dapr/issues/3271

Where should the new material be placed? Add to Dapr Docs

The associated pull request from dapr/dapr, dapr/components-contrib, or other Dapr code repos https://github.com/dapr/dapr/issues/3271

Additional context