Remove unnecessary tsconfig arguments

[snario]

Removes skipLibCheck, paths, and baseUrl from base typescript config. It's not clear from the commit history why these were added, and the integration tests have passed for me locally on a fresh build with these changes added.

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Latest commit: 5737ebd

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Requesting review by Georgios

[smartcontracts]

Requesting that @gakonst take a look at this -- was this something you added?

[gakonst]

this is useful so that your IDE/editor can have code navigation/completion features just by cloning the repo, without requiring you to build it.

"paths": {
      "@eth-optimism/*": ["packages/*/src", "integration-tests/*/test"]
    },

The baseUrl and skipLibCheck can go.

[gakonst]

Let's keep this. OK with removing the others.

[snario]

This affects certain packages behaviour. For example, running tslint in packages/contracts will lead to linting of packages/smock I think because it interprets it as part of the source code. I haven't fully debugged that example in particular but removing this line fixes it.

Do we need that feature? I prefer building the packages and using TypeScript's Project References.

[gakonst]

KK - was thinking it's a better experience, but if it's a PITA np.