fix(jsii): unable to depend on modules with private declarations (#995)

Due to a TypeScript [bug], it was impossible to write a jsii module
that takes a dependency on a module that has private type declarations
in their d.ts file since they are untyped by definition.

This temporary fix sets `noImplicitAny` to `false` in order to disable
this check and enable the dependency use case until we upgrade to the 3.7.x
version-line.

Fixes #994

[bug]: microsoft/TypeScript#33894

packages/jsii/lib/compiler.ts

@@ -20,7 +20,7 @@ const COMPILER_OPTIONS: ts.CompilerOptions = {
   module: ts.ModuleKind.CommonJS,
   noEmitOnError: true,
   noFallthroughCasesInSwitch: true,
-  noImplicitAny: true,
+  noImplicitAny: false, // temporarily "false" until we upgrade typescript in order to solve #994
   noImplicitReturns: true,
   noImplicitThis: true,
   noUnusedLocals: true,