feat: add max request and response body size attributes to http-logger plugin

[MariaLapovska]

Description

In some cases APISIX users might want to customize the max size of request/response body sent to HTTP server via http-logger plugin to be lower/higher than the current default value of 512KiB.

kafka-logger plugin already supports max_resp_body_bytes and max_req_body_bytes attributes, so I followed the example and added them in this PR.

[MariaLapovska]

Hi @Baoyuantop ! I've created the issue for this PR per your request

[Baoyuantop]

From the current code, these properties are defined in public functions with #11133

It looks like other log-like plugins can configure these settings directly, but for APISIX, do we need to standardize the documentation of other log plugins and add relevant tests?

[MariaLapovska]

@Baoyuantop don't max_req_body_bytes and max_resp_body_bytes need to be defined in the logging plugins schemas to actually be evaluated?

[Baoyuantop]

The schema of these plugins does not define additionalProperties = false, which means that you can add these properties directly in the plugin's configuration, but this behavior is untested and may have unexpected problems.

So I think it's still recommended to supplement the corresponding documentation and tests.