[ISSUE #5233] Preserve common HTTP JSON payloads

[nkgotcode]

Fixes #5233

Motivation

The HTTP connector common protocol fails when it receives a JSON object body because the request payload is parsed as a Java String. A JSON object such as {"name":"Andy"} cannot be deserialized that way, so the connector rejects a valid request body.

Modifications

The common HTTP protocol now preserves the raw request body string before enqueuing the WebhookRequest. A regression test starts the Vert.x route through CommonProtocol, posts a JSON object, verifies the HTTP 200 response, and checks that the queued request payload is unchanged.

Validation:

docker run --rm -v "$PWD":/workspace -w /workspace eclipse-temurin:8-jdk ./gradlew :eventmesh-connectors:eventmesh-connector-http:test --tests org.apache.eventmesh.connector.http.source.protocol.impl.CommonProtocolTest --no-daemon --stacktrace

BUILD SUCCESSFUL

Documentation

• Does this pull request introduce a new feature? no
• If yes, how is the feature documented? not applicable
• If a feature is not applicable for documentation, explain why? This fixes request payload handling for an existing connector protocol.
• If a feature is not documented yet in this PR, please create a followup issue for adding the documentation

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