[modify] force rebuild when SEND_TIME_ERROR

[fix] fix cpp compile error

[fix] missing init producer with 0

[add] add log_producer_client_get_flush_thread_id for linux
[add] add interface&send_timeout&destroy_timeout config for producer
[add] add log_producer_client_add_raw_log_buffer
[add] add LOG_PRODUCER_SEND_EXIT_BUFFERED
[modify] refine readme

[modify] refine max buffer size update logic

[fix] can't shutdown when sub manager is error

add log number

解决 ”sender线程池销毁最大等待时间“ 配置使用错误问题。

Update log_producer_sender.c

[modify] change default compile mode to Relese

Replace the pintf long format with long long.
 
Background info: got the following errors while making the project: 
error: format specifies type 'long'
      but the argument has type 'int64_t' (aka 'long long') [-Werror,-Wformat]
        header = apr_psprintf(t->pool, "Content-Length: %" APR_INT64_T_FMT, t->req->body_len);