Added an option to set custom FlagErrorHandling

[gapra-msft]

Resolves #1633

[CLAassistant]

All committers have signed the CLA.

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[gapra-msft]

removing stale label

[github-actions]

The Cobra project currently lacks enough contributors to adequately respond to all PRs. This bot triages issues and PRs according to the following rules:

• After 60d of inactivity, lifecycle/stale is applied. - After 30d of inactivity since lifecycle/stale was applied, lifecycle/rotten is applied and the PR is closed.
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[gapra-msft]

removing stale label

[github-actions]

The Cobra project currently lacks enough contributors to adequately respond to all PRs. This bot triages issues and PRs according to the following rules:

• After 60d of inactivity, lifecycle/stale is applied. - After 30d of inactivity since lifecycle/stale was applied, lifecycle/rotten is applied and the PR is closed.
  You can:
• Make a comment to remove the stale label and show your support. The 60 days reset. - If a PR has lifecycle/rotten and is closed, comment and ask maintainers if they'd be interseted in reopening.

[gapra-msft]

removing stale label

[github-actions]

The Cobra project currently lacks enough contributors to adequately respond to all PRs. This bot triages issues and PRs according to the following rules:

• After 60d of inactivity, lifecycle/stale is applied. - After 30d of inactivity since lifecycle/stale was applied, lifecycle/rotten is applied and the PR is closed.
  You can:
• Make a comment to remove the stale label and show your support. The 60 days reset. - If a PR has lifecycle/rotten and is closed, comment and ask maintainers if they'd be interested in reopening.