feat(bundler-vite): improve chunk name

[Mister-Hope]

[Mister-Hope]

This ensure a chunk is not started by _, solution comming from vitepress, the idea is editing the original sanitizeFileName and remove the trailling underscore.

[Mister-Hope]

Done

[Mister-Hope]

Edge case: people are using markdown starting with _, I will fix this and then mark this ready.

[Mister-Hope]

Any update on reviewing this?

[Mister-Hope]

Emm that function is redirectly copied from rollup, and was used exactly on the same option.

I though we can trust rollup code as we are using rollup ourselves. however if you do insist a unit test is still needed, I can add some. (I already add a reference link to the original function in rollup repo)

[meteorlxy]

OK, I forgot that is was forked from rollup. Ignore that.