Add build a provider page (#14946)

* add build a provider page

* edit typos

* Update content/docs/iac/using-pulumi/extending-pulumi/build-a-provider.md

Co-authored-by: Eron Wright <[email protected]>

* Update content/docs/iac/using-pulumi/extending-pulumi/build-a-provider.md

Co-authored-by: Eron Wright <[email protected]>

* update code sample

* change dispatch language

* Update content/docs/iac/using-pulumi/extending-pulumi/build-a-provider.md

Co-authored-by: Eron Wright <[email protected]>

* Update content/docs/iac/using-pulumi/extending-pulumi/build-a-provider.md

Co-authored-by: Eron Wright <[email protected]>

* Update content/docs/iac/using-pulumi/extending-pulumi/build-a-provider.md

Co-authored-by: Eron Wright <[email protected]>

* update per review

* add run error handling and notes about WithNamespace

* update language re: schema

* update for new infer.Resource syntax

---------

Co-authored-by: Eron Wright <[email protected]>
Co-authored-by: Bryce Lampe <[email protected]>

Author: 3 people