Introduce editorconfig for fixing and keeping common code formatting across multiple tools.

[JanuszNowak]

az feedback auto-generates most of the information requested below, as of CLI version 2.0.62

Related command

Describe the bug

Different code formatting like:

• indent_style
• indent_size
• encoding
• end_of_line
• insert_final_newline
  Is applied by different committers, editorconfig is supporting multiple tools like VS, VScode and many more.

To Reproduce

Expected behavior

Environment summary

Additional context

[yonzhan]

It seems that this issue is not related to Azure CLI.

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