feat (format): Introduce buf (#519)

* feat(spark): Refactoring datasources (#514)

### Reason for this PR
By moving datasources under `org.apache.spark.sql` we are able to access private Spark API. Last time when I was trying to fully migrate datasources to V2 it was a blocker. Detailed motivation is in #493 

### What changes are included in this PR?
Mostly refactoring.

### Are these changes tested?
Unit tests are passed

I manually checked the generated JARs:
![image](https://github.com/apache/incubator-graphar/assets/29755009/1b094516-88b1-490a-a2ea-8dcd092a3b1d)

### Are there any user-facing changes?
Mostly not because `GarDataSource` was left under the same package.


Close #493

* feat(dev): Add release and verify scripts (#507)

Reason for this PR
Add scripts for developer or release manager to easily release version or verify a version.

What changes are included in this PR?
Add release and verify scripts
related document is updated to website, see Update the release and verify document, and add development document incubator-graphar-website#18
Are these changes tested?
yes

Are there any user-facing changes?
no
---------

Signed-off-by: acezen <[email protected]>

* chore: Bump to version v0.12.0 (Round 1) (#517)


Signed-off-by: acezen <[email protected]>

* chore: Add CHANGELOG.md (#513)


Signed-off-by: acezen <[email protected]>

* Introduce buf

- v2
- buf.gen
- buf

 On branch format-definition-dev
 Your branch is up to date with 'origin/format-definition-dev'.

 Changes to be committed:
	new file:   buf.gen.yaml
	new file:   buf.yaml
	modified:   format/adjacent_list.proto
	modified:   format/edge_info.proto
	modified:   format/graph_info.proto
	modified:   format/property_group.proto
	modified:   format/types.proto
	modified:   format/vertex_info.proto

---------

Signed-off-by: acezen <[email protected]>
Co-authored-by: Weibin Zeng <[email protected]>

buf.gen.yaml

@@ -0,0 +1,18 @@
+version: v2
+managed:
+  enabled: true
+  disable:
+    - file_option: java_package
+plugins:
+  # Python classes
+  - remote: buf.build/protocolbuffers/python:v27.1
+    out: pyspark/graphar_pyspark/proto/
+  # Python headers for IDEs and MyPy
+  - remote: buf.build/protocolbuffers/pyi
+    out: pyspark/graphar_pyspark/proto/
+  # Cpp
+  - remote: buf.build/protocolbuffers/cpp:v27.1
+    out: cpp/src/proto
+  # Java
+  - remote: buf.build/protocolbuffers/java:v27.1
+    out: maven-projects/info/src/main/java/

buf.yaml

@@ -0,0 +1,3 @@
+version: v2
+modules:
+  - path: format

format/adjacent_list.proto

@@ -20,7 +20,8 @@
 syntax = "proto3";
 
 package graphar;
-option java_package = "org.apache.graphar.info";
+option java_multiple_files = true;
+option java_package = "org.apache.graphar.info.proto";
 
 import "types.proto";
 

format/edge_info.proto

@@ -20,7 +20,8 @@
 syntax = "proto3";
 
 package graphar;
-option java_package = "org.apache.graphar.info";
+option java_multiple_files = true;
+option java_package = "org.apache.graphar.info.proto";
 
 import "property_group.proto";
 import "adjacent_list.proto";

format/graph_info.proto

@@ -20,7 +20,8 @@
 syntax = "proto3";
 
 package graphar;
-option java_package = "org.apache.graphar.info";
+option java_multiple_files = true;
+option java_package = "org.apache.graphar.info.proto";
 
 import "vertex_info.proto";
 import "edge_info.proto";

format/property_group.proto

@@ -20,7 +20,8 @@
 syntax = "proto3";
 
 package graphar;
-option java_package = "org.apache.graphar.info";
+option java_multiple_files = true;
+option java_package = "org.apache.graphar.info.proto";
 
 import "types.proto";
 

format/types.proto

@@ -20,7 +20,8 @@
 syntax = "proto3";
 
 package graphar;
-option java_package = "org.apache.graphar.info";
+option java_multiple_files = true;
+option java_package = "org.apache.graphar.info.proto";
 
 enum DataType {
     BOOL = 0;

format/vertex_info.proto

@@ -1,4 +1,4 @@
-/*
+ /*
  * Licensed to the Apache Software Foundation (ASF) under one
  * or more contributor license agreements.  See the NOTICE file
  * distributed with this work for additional information
@@ -20,7 +20,8 @@
 syntax = "proto3";
 
 package graphar;
-option java_package = "org.apache.graphar.info";
+option java_multiple_files = true;
+option java_package = "org.apache.graphar.info.proto";
 
 import "property_group.proto";