Fix build errors after zk file

[mitschabaude]

this PR makes two changes which are a frequent source of errors when building fresh projects, and in particular, currently break at least two of the tutorials

• remove the isolatedModules flag from the TS config. this flag frequently causes errors about not being able to compile files without import/exports (e.g., as created by the zk file command). I don't see benefits of having this flag on which would make up for that
• change the zk file command, to not add an import in the test file like import Contract from './Contract'
  • since the Contract.ts file is initially empty, the test file is initially wrong and can't be built
  • also, it assumes that the smart contract is exported as default, while all our examples export it as a named export
  • so I commented the line out in the test, and changed it to assume a named export

I'm also bumping the version number to get this fix to the community quickly

[ymekuria]

LGTM!