feat: add Apply method to CmdArgParser

[BorysTheDev]

Summary: This PR extends facade::CmdArgParser with a bulk option-parsing API to simplify command argument handling.

Changes:

• Added CmdArgParser::Apply() and ApplyOrSkip() for greedy option matching over remaining args.
• Introduced helper option builders Exist() and Tag() (including a lambda handler form) to express common parsing patterns.
• Extended Convert() to support parsing into std::optional.
• Added unit tests covering Apply/ApplyOrSkip, lambda handlers, and optional parsing.
• Refactored list commands to use the new APIs (e.g. COUNT parsing in LMPOP/BLMPOP and option handling in LPOS).

Technical Notes: Apply stops on the first unmatched token (caller may Finalize() for strictness), while ApplyOrSkip consumes unknown tokens to allow permissive parsing.

[augmentcode]

🤖 Augment PR Summary

Summary: This PR expands facade::CmdArgParser with a bulk option-parsing API to simplify and standardize command argument handling.

Changes:

• Added CmdArgParser::Apply() and ApplyOrSkip() to greedily match named options across remaining args.
• Introduced option builders Exist() (flag) and Tag() (tag + typed values), including a callable handler form for custom parsing.
• Extended Convert() to support parsing into std::optional<T>.
• Added unit tests covering Apply/ApplyOrSkip behavior, missing-value error surfacing, lambda handlers, and optional parsing.
• Refactored list commands (LMPOP/BLMPOP/LPOS) to use the new parsing helpers.

Technical Notes: Apply() stops on first unmatched token (optionally followed by Finalize() for strict parsing), while ApplyOrSkip() consumes unknown tokens for permissive parsing.

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[augmentcode]

Review completed. 2 suggestions posted.

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[Copilot]

Pull request overview

This PR extends facade::CmdArgParser with bulk option parsing helpers (Apply / ApplyOrSkip) and supporting option descriptors (Tag, Exist), and updates list command parsing to use the new API.

Changes:

• Add CmdArgParser::Apply / ApplyOrSkip plus Tag/Exist option helpers in cmd_arg_parser.h.
• Extend parsing to support std::optional<T> targets via Convert().
• Refactor LPOS, LMPOP, and BLMPOP option parsing to use the new helpers, and add unit tests for the new APIs.

Reviewed changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated 1 comment.

File	Description
src/server/list_family.cc	Switches list command option parsing to the new Check(..., &out) and ApplyOrSkip(Tag(...)) style.
src/facade/cmd_arg_parser_test.cc	Adds new unit tests for Apply, ApplyOrSkip, lambda-tag handlers, and optional targets.
src/facade/cmd_arg_parser.h	Introduces Apply / ApplyOrSkip, Tag/Exist option types, and optional conversion support.

[BorysTheDev]

augment review

[augmentcode]

Review completed. 1 suggestion posted.

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[vyavdoshenko]

lgtm