Add Blue/Green Cluster Migration Feature to Client Matrix (#1083)

* Add Blue/Green Cluster Migration feature to client matrix

Add PIP-188 Blue/Green migration support information to the Pulsar Client
Feature Matrix for client, producer, consumer, and reader sections.

Changes:
- Add Blue/Green Cluster Migration section with PIP-188 support, minimum
  broker version, and minimum client version for each language
- Add Blue/Green Migration Support entries to Producer, Consumer, and
  Reader sections showing feature availability per client

Supported Clients:
- Java: Full support (broker 3.0.0+, client 3.3.4+/4.0.2+/4.1.0+)
- C++: Full support (broker 3.0.0+, client 3.5.0+)
- Go: Full support (broker 3.0.0+, client 0.13.0+)
- DotPulsar: Partial support (broker 3.0.0+, implementation unverified)
- Python: Not supported
- Node.js: Not supported
- Rust: Not supported
- .NET (F#): Not supported

This provides users with clear guidance on which clients support
zero-downtime cluster migration via PIP-188.

* Simplify Blue/Green Cluster Migration matrix entry

Remove nested sub-features and use single entry with support levels
(2=Full, 1=Partial, 0=Not Supported) consistent with other matrix entries.

Author: codelipenghui

data/matrix.js

@@ -281,6 +281,20 @@ module.exports = {
       Websocket: 0,
       REST: 0,
     },
+    {
+      Feature: "Blue/Green Cluster Migration",
+      Java: 2,
+      "C++": 2,
+      Go: 2,
+      Python: 0,
+      Nodejs: 0,
+      Rust: 0,
+      "C#/DotPulsar": 1,
+      "DotPulsar": 1,
+      "NET(C#/F#/VB)": 0,
+      Websocket: 0,
+      REST: 0,
+    },
   ],
   producer: [
     {
@@ -620,6 +634,20 @@ module.exports = {
       Websocket: 0,
       REST: 0,
     },
+    {
+      Feature: "Blue/Green Migration Support",
+      Java: 2,
+      "C++": 2,
+      Go: 2,
+      Python: 0,
+      Nodejs: 0,
+      Rust: 0,
+      "C#/DotPulsar": 1,
+      "DotPulsar": 1,
+      "NET(C#/F#/VB)": 0,
+      Websocket: 0,
+      REST: 0,
+    },
   ],
   consumer: [
     {
@@ -1123,6 +1151,20 @@ module.exports = {
       Websocket: 0,
       REST: 0,
     },
+    {
+      Feature: "Blue/Green Migration Support",
+      Java: 2,
+      "C++": 2,
+      Go: 2,
+      Python: 0,
+      Nodejs: 0,
+      Rust: 0,
+      "C#/DotPulsar": 1,
+      "DotPulsar": 1,
+      "NET(C#/F#/VB)": 0,
+      Websocket: 0,
+      REST: 0,
+    },
   ],
   reader: [
     {
@@ -1406,6 +1448,20 @@ module.exports = {
       Websocket: 0,
       REST: 0,
     },
+    {
+      Feature: "Blue/Green Migration Support",
+      Java: 2,
+      "C++": 2,
+      Go: 2,
+      Python: 0,
+      Nodejs: 0,
+      Rust: 0,
+      "C#/DotPulsar": 1,
+      "DotPulsar": 1,
+      "NET(C#/F#/VB)": 0,
+      Websocket: 0,
+      REST: 0,
+    },
   ],
   tableview: [
     {