refactor: replace globby w/ fast-glob

[SukkaW]

Under the hood, globby is powered by fast-glob with extra features, but none of them are utilized by the unbuild.

Since the unbuild doesn't utilize those extra features, I propose replacing globby with fast-glob to reduce the installation size.

Here is globby's feature description:

• Promise API
  • fast-glob also has promise-based API
• Multiple patterns
  • globby's multiple patterns support is powered by fast-glob directly
• Negated patterns: ['foo*', '!foobar']
  • globby's negated patterns support is also powered by fast-glob directly
• Expands directories: foo → foo/**/*
  • unbuild doesn't rely on this feature
• Supports .gitignore and similar ignore config files
  • unbuild doesn't rely on this feature since globby disabled this feature by default and unbuild doesn't enable it.
• Supports URL as cwd
  • Currently unbuild passed the string path to cwd, and we can use Node.js built-in url.fileURLToPath in case we encounter URLs in the future.

See also typescript-eslint/typescript-eslint#9453