feat: bulk write pipeline

[fengjiachun]

As the title

[Copilot]

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• ingester-bulk-protocol/pom.xml: Language not supported
• ingester-example/src/main/resources/log4j2.xml: Language not supported

Comments suppressed due to low confidence (2)

ingester-bulk-protocol/src/main/java/io/greptime/BulkWriteService.java:161

• Ensure that the ownership and lifecycle of metadataBuf is clearly documented and that listener.putNext(metadataBuf) consistently releases the buffer. This is important to avoid potential memory leaks if internal behavior changes in the future.

metadataBuf = this.allocator.buffer(metadata.length);

ingester-bulk-protocol/src/main/java/io/greptime/BulkWriteManager.java:141

• The updated method signature no longer includes a database parameter. Please ensure this change is intentional and that all upstream consumers are updated accordingly.

public BulkWriteService intoBulkWriteStream(String table, Schema schema, long timeoutMs, CallOption... options) {