[Epic] Document TT CLI - future plans

[p7nov]

Total: 4 sp

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Dev board ref.:
https://github.com/tarantool/roadmap-internal/issues/59
tarantool/tt#8

PM ref.: https://www.notion.so/tarantool/TT-CLI-80cbe807b1d14aaa92a32f936d5271af

Unified command-line interface for Tarantool.

SME: @ LeonidVas

Follow-up of #3168

This epic is a container for doc tasks for features that aren't developed yet (as of March 2023).
We don't have specific plans on writing these docs, just defining the possible scope.

Tasks

Create a Cartridge CLI-style reference.

Batch 5 (9sp)

• [2pt] tt daemon auth #2563
• tt instance parameters in instances.yml #3156
• tt cfg dump #3273
• tt daemon/remote #2562

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Total: 9 sp

[p7nov]

One more future plan - tt enable - add an app to instances_enabled