feat: supports escape dot for `unflatten`

[serkodev]

Fix #87

This PR adds support for escaping dots in keys when using the flat.funflatten.

Please see test unit inside unflatten.test.ts for more details of handling escaped cases.

Need Help

In frontmatter.ts, it works well in parseFrontMatter. But I'm not sure why need to call unflatten again inside stringifyFrontMatter & stringifyCodeBlockProps originally, does it need to be flattened instead of unflattened?

Currently the stringify output of playground (right side) seems unflattened again so it's not same as the input area.

[codesandbox[bot]]

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