Move test utils in the src dir

[andreivladbrg]

Changelog:

refactor: move test utils in src dir
build: install prb test as npm package
build: remove prb test git module
ci: install node js dependencies in build and test job
chore: update remappings accordingly

As mentioned in my comment here, importing files from the ~test/ path is not possible in the NPM package because this folder doesn't exist.

Inevitably, to make this fully compatible with the idea presented in the discussion linked above, I had to install prb-test as an NPM package.

[andreivladbrg]

Context: here, StdUtils is imported, assuming a remappings set for forge-std/=lib/forge-std/src/
exists.

Question: Should forge-std also be installed as a node module?
My initial answer was no, because if there are other projects that need these test utils they are also working on a foundry project (with forge-std remapping considered as the default configuration), otherwise, if one is testing in Hardhat, a contract as a util would not be needed, no?

Am I missing something and we should install as NPM package like this "@forge-std": "github:foundry-rs/forge-std#commit_hash"?

[PaulRBerg]

Thanks @andreivladbrg, just letting you know that it will take me a while until I find the time to pick this PR up.

[PaulRBerg]

looks good but could you also please install Forge Std from npm?

[PaulRBerg]

because if there are other projects that need these test utils they are also working on a foundry project (with forge-std remapping considered as the default configuration), otherwise, if one is testing in Hardhat, a contract as a util would not be needed, no?

Foundry should support nested remappings but I agree that it would be worth testing the set-up before merging this PR.

[andreivladbrg]

Addressed everything in my latest commits.

[PaulRBerg]

I've changed my mind about this PR.

Instead of moving the test utils in src, we could instead whitelist the test/utils directory to be included in the npm package.

We just need to add test/utils here:

prb-math/package.json

Lines 16 to 19 in abdf0b2

	"files": [
	"src",
	"CHANGELOG.md"
	],

[PaulRBerg]

Thanks @andreivladbrg for the latest commit, but I would prefer to open a new PR to start with a clean slate!

[andreivladbrg]

Clossing in favor of #211