Remove rimraf and mkdirp dependencies

[davidrapin]

Problem to solve

• rimram is installed as a prod dependency but is only used in tests in one place, it has a lot of sub-dependencies, some of them with security problems.
• mkdirp is only used in one place

Solution

• rimraf is not needed anymore, since Node.js has an equivalent function (rmSync with recursive=true) since Node.js v14.14 (source)
• mkdirp is not needed anymore, since Node.js has an equivalent function (mkdirSync with recursive=true) since Node.js v10.12 (source)

[benmccann]

it's a bit inconsistent that node: was added here, but not the two lines below

[davidrapin]

Indeed, open to change that, I wanted to keep this PR focused to increase the chances of it getting merged.

[43081j]

@isaacs any chance we can get a review of this?

Looks like ci minimum version is high enough to support this too

[DaleGardner]

@isaacs This package currently has a high severity security vulnerability (because of an issue with a dependency of rimraf) until this PR is merged and released. Info on the vuln:

https://security.snyk.io/vuln/SNYK-JS-CROSSSPAWN-8303230
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