Prevent log creation when no CLI command runs

[nightcityblade]

What is the purpose of this pull request?

• Documentation update
• Bug fix
• Feature addition or enhancement
• Code maintenance
• DevOps
• Improve developer experience
• Others, please explain:

Fixes#2829

Overview of changes:

• Defer the rotating file transport until Commander is about to execute a command.
• Keep help and missing-command invocations from creating _markbind/logs.
• Add a regression test for invoking MarkBind without a command.

Anything you'd like to highlight/discuss:

File logging remains enabled for real commands, and initialization is idempotent.

Testing instructions:

N/A; the behavior is covered by the automated CLI tests.

Proposed commit message: (wrap lines at 72 characters)

Delay CLI file logging until command

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Checklist: ☑️

• Updated the documentation for feature additions and enhancements
• Added tests for bug fixes or features
• Linked all related issues
• No unrelated changes

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Reviewer checklist:

Indicate the SEMVER impact of the PR:

• Major (when you make incompatible API changes)
• Minor (when you add functionality in a backward compatible manner)
• Patch (when you make backward compatible bug fixes)

At the end of the review, please label the PR with the appropriate label: r.Major, r.Minor, r.Patch.

Breaking change release note preparation (if applicable):

• To be included in the release note for any feature that is made obsolete/breaking

Give a brief explanation note about:

• what was the old feature that was made obsolete
• any replacement feature (if any), and
• how the author should modify his website to migrate from the old feature to the replacement feature (if possible).

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 71.32%. Comparing base (36426c7) to head (1479843).

Additional details and impacted files

@@ Coverage Diff @@## master #2919 +/- ##
=======================================
Coverage 71.32% 71.32% =======================================
Files 133 133 Lines 7234 7234 Branches 1612 1581 -31 =======================================
Hits 5160 5160 Misses 2068 2068 Partials 6 6 

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