feat: support file-logger plugin of response body record

[pixeldin]

Description

Providing some optional setting items for file-logger to control the output log content as requested in #8331.

I refer some options of the http-logger:
include_req_body, include_resp_body and include_resp_body_expr

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)

[tzssangglass]

hi @pixeldin , we have error log as attempt to set ngx.status after sending out response headers, we need to avoid call ngx.status = code after ngx.say, try with

diff --git t/plugin/file-logger2.t t/plugin/file-logger2.t
index ccd1d9f5..ad4396c0 100644
--- t/plugin/file-logger2.t
+++ t/plugin/file-logger2.t
@@ -164,7 +164,6 @@ contain with target
 
             if new_msg.response.body == "hello world\n"
             then
-                ngx.status = code
                 ngx.say('contain target body hits with expr')
             end
 
@@ -174,7 +173,6 @@ contain with target
             local new_msg = core.json.decode(msg)
             if new_msg.response.body == nil
             then
-                ngx.status = code
                 ngx.say('skip unconcern body')
             end
         }

[pixeldin]

@tzssangglass please retrigger the CI workflow, the running state seems unstable.

[spacewander]

@tzssangglass please retrigger the CI workflow, the running state seems unstable.

Done