feature/add filters for the debug level logs

[NeJan2020]

Description

add an option name debug_selector to filter debug_log from different components

Related Issue

#298

NewOption named debug_selector

This option can be compatible with the previous version.
If this option is empty or not SETUP, all component will print their debug log normally.

observability:
  logger:
    console_level: info # debug,info,warn,error,none
    file_level: info
    # debug_selector is used to filter debug message from different components
    # 1. This filter will not take effect when there is no element in the debug_selector list
    # 2. If the list is not empty, only the components contained in this list will print debug message
    # 3. The name of each component is defined above, such as `receiver.cgoreceiver`, `exporter.otelexporter`, only the second part of the config name needed
    # e.g debug_selector: ["cgoreceiver","otelexporter"]
    debug_selector: []