[ISSUE #109] queryWebHookConfigById endpoint causes NPE and returns empty response & Optimize Hard-coding

[Pil0tXia]

Fixes #109.

This is a synchronised modification of this issue: apache/eventmesh#4243

When inserting the config, the path contains manufacturerName, and the same logic applies when querying. Therefore, if we follow the request example in the documentation, it will result in an NPE (NullPointerException).

There are two possible solutions, with no impact on users. One way is to retrieve manufacturerName from callbackPath when making a query on our end. However, this would require specifying in the documentation that manufacturerName must be included in users' callbackPath, which doesn't seem like a common practice.

A simpler solution is to include manufacturerName in the request. Since there are likely no users for our webhook at the moment, I will go with the latter option.

[Pil0tXia]

The 2 commits below are synchronised modifications of this issue: [Enhancement] Optimize Webhook Manufacturer source Hard-coding apache/eventmesh#4243