Remove rimraf dep and use fs.rm with recursive and force options

[nelsonni]

Is your feature request related to a problem? Please describe.
The fs.rm method in Node.js v14.14.0 includes recursive and force options which enable the same behavior as rimraf for deep directory removal. fs-extra v9.1.0 also includes Promise support for the fs.rm method, which was pulled into Synectic in PR #300.

The rimraf package has become redundant and as such should be removed to save space on subsequent Synectic builds.

Describe the solution you'd like
Switch all usage of rimraf to fs.rm with recursive and force options enabled. Remove rimraf and @types/rimraf dependencies.

Describe alternatives you've considered
N/A

Additional context
Specific discussion relating to the redundant nature of rimraf following fs-extra v9.1.0 can be found on jprichardson/node-fs-extra#806.

[nelsonni]

Replacing fs-extra/remove for calls to rimraf within the code is a straightforward swap, but we also use rimraf as a CLI command within package.json:

synectic/package.json

Line 15 in 7067a3f

"clean": "rimraf out/ .webpack/ coverage/ yarn-error.log",

In order to replace this script command, we add fse-cli package in order to expose fs-extra commands at the CLI level; see a1126a5.