fix(cli): indent multiline alias descriptions

[OnlyYu1996]

Summary

• indent every line of multiline alias descriptions in alias set, alias list, and alias show
• align continuation lines under the Description: value column
• unblock cortex-cli test compilation by importing read_file_with_encoding from its current module

Fixes PlatformNetwork/bounty-challenge#53226.

Validation

• cargo +stable fmt --package cortex-cli --check
• cargo +stable test --package cortex-cli alias_cmd::tests
• cargo +stable check --package cortex-cli --lib
• git diff --check

[greptile-apps]

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