Include .proto files in datafusion-proto-common distribution (#20921)

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- Closes #20920 

## Rationale for this change

- see #20920

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Author: haohuaijin

datafusion/proto-common/Cargo.toml

@@ -28,9 +28,6 @@ license = { workspace = true }
 authors = { workspace = true }
 rust-version = { workspace = true }
 
-# Exclude proto files so crates.io consumers don't need protoc
-exclude = ["*.proto"]
-
 [package.metadata.docs.rs]
 all-features = true