add leading and trailing slash sanitization for params

[FredKSchott]

Changes

• Someone reported an issue where getStaticPaths were silently failing to match expected params (see the error above)
• This was due to them constructing their own route params, and incorrectly assuming that they needed a trailing slash in the slug in order to match a trailing slash in the URL.
• Since we handle this for you at the Astro layer, I can't think of a world where / would be expected behavior either leading or trailing in some route param.
• Therefore, I got nerd sniped into adding some simple route param sanitization

Testing

• Test added

Docs

• No docs needed

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🦋 Changeset detected

Latest commit: 5d5faa2

The changes in this PR will be included in the next version bump.

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[natemoo-re]

LGTM!