feat: clap_completion

[TwistingTwists]

• autocompletion for the cli

No issue created yet.

Description

Adding auto completion for the cli - to ease developer UX.

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This PR has:

• been tested to ensure log ingestion and log query works.
• added comments explaining the "why" and the intent of the code wherever would not be obvious for an unfamiliar reader.
• added documentation for new or modified features or behaviors.

[TwistingTwists]

Questions about this PR:

1. it changes the CONFIG struct. Since, CONFIG is used almost everywhere in code, it'll cause lots of small changes across codebase. The changes will look like this

2. Currently the new enum ParseableCommand delegates the methods related to Config struct in impl ParseableCommand.
   I think this could be handled by defining a trait .

Is there an alternate approach I haven't considered that you would like me to try?