Default closest_limit to 100 instead of 10

[anjackson]

Description

Raise the default limit of the number of records returned when querying CDX for the closest records.

Motivation and Context

At UKWA we're hitting cases where crawl variation means we have e.g. a lot of redirect records and in these cases the 10 record limit is too low. I can't see any way of configuring this value, so I'm proposing the default is raised.

Types of changes

• Replay fix (fixes a replay specific issue)
• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)

Checklist:

• My change requires a change to the documentation.
• I have updated the documentation accordingly.
• I have added or updated tests to cover my changes.
• All new and existing tests passed.

[ikreymer]

Thanks! Yeah, I think that should be fine, I don't know if there's a need to set the limit lower, so this seems sufficient.
Can add an option to configure the limit if it becomes an issue.