feat: add option to show more than 10 spelling mistakes in the action summary

[Nightblade]

It appears that 10 is the maximum number of spelling mistakes that can appear in the action summary, and there's no way to increase it.

For example, the following run shows there are 23 issues and it shows 10 of them in the summary. I know you can "drill down" to see more in the logs, but I think many people will just assume there are only 10.

[Jason3S]

@Nightblade,

You are seeing a limitation of GitHub Workflows.

I think a viable enhancement is to add an optional report to the PR showing the issues.

[Nightblade]

Sounds good!

[Nightblade]

Ah yes, this is probably why I was asking about capturing the output from cspell-action -- so I could make a pretty $GITHUB_STEP_SUMMARY in the event of >10 spelling mistakes.