Shotaro Yamasaki

It seems that the CI for Go is failing. ``` go test ./... -short -race ? github.com/vmihailenco/msgpack/v5/msgpcode [no test files] make: *** [Makefile:3: test] Terminated Error: Process completed with exit...

**What I did** The current isnil function was causing panic when an array was given as an argument, so this has been changed. Also, interface{} was changed to any and...

refactor(logger) : Deprecate the Discord, Slack structures, and send logs via a Handler.

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resolve : https://github.com/seipan/loghook/issues/30 Originally, we had structures named Discord and Slack, each containing a webhook URL, and used these structures to switch between slack and discord types to send logs....

docs(logger) : Add more document for method

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Add more document.

Allow indented parsing of logs to json

Create with function as a method of logger. This is the same as the one in log/slog, etc.

## What type of PR is this? - feature ## What this PR does / why we need it: Before functions weren't being executed when users ran ```--help``` or ```-h```...