feat(http-logger): add max request and response body size attributes

[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.
For this purpose two new attributes are introduced to http-logger plugin (similar to the existing ones in kafka-logger, taking advantage of the functionality that's already implemented in log-util):

• max_resp_body_bytes
• max_req_body_bytes

Checklist

• I have explained the need for this PR and the problem it solves
• I have explained the changes or the new features added to this PR
• [] I have added tests corresponding to this change
• I have updated the documentation to reflect this change
• I have verified that this change is backward compatible (If not, please discuss on the APISIX mailing list first)

[MariaLapovska]

Hi @shreemaan-abhishek!
I'm trying to add these attributes based on your PR - could you help me out with tests? I'm a complete newbie in Lua/Perl but we're using APISIX for our Java project and really need this functionality 😅

[Baoyuantop]

Hi @MariaLapovska, are you currently experiencing any difficulties? Please describe in more detail so that others can help.

[MariaLapovska]

@Baoyuantop I have added max_resp_body_bytes and max_req_body_bytes attributes for http-logger plugin (to be able to limit max request/response body size logged), following the example and reusing the logic that @shreemaan-abhishek has already implemented in this PR.
I am a Java dev, so I don't have enough expertise to write tests for this feature. Would it be possible for anyone to help me out with adding tests for logging large body via http-logger, same as the existing tests for kafka-logger?