fix(cli): Normalize globby path for cli build command

[bhuynhdev]

Component / Package Name:

This PR contains:

• bugfix
• feature
• refactor
• documentation
• other

Are tests included?

• yes (bugfixes and features will not be merged without tests)
• no

I used the existing test suite and did not make any new tests

Breaking Changes?

• yes (breaking changes will not be merged unless absolutely necessary)
• no

List any relevant issue numbers:

resolves #41

Description

As discussed in #41, the jsx-email's CLI build command use globby to search for file names to read, build, and write to. However, per sindresorhus/globby#179, on Windows system, Globby won't work as Windows path contains backslashes but Globby only wants path with forward slashes.
Therefore, a normalizePath function (inspired by rollup) was used to normalize the path so it would work on both Windows and UNIX systems

[shellscape]

Thanks for getting this in. Will merge as soon as CI is done.

In other news, pnpm has prioritized a fix for the issue that is preventing us from running the Windows CI workflow here. Hoping that we get a fix soon and can enable better Windows support in development.

[shellscape]