Support sign raw in the Policy Engine

[wcalderipe]

This PR adds support for signRaw action in the policy engine. It also refactors some of the existing plain types to use Zod schemas.

Finally, it adds a top-level test recipe in the makefile to test a very single project. This is useful when you have cross project changes, and you want to make sure everything is working as expected.

Zod records with custom types

In Zod, when you define a record with primitives like z.record(z.string(), z.string()), the inferred type is indeed Record<string, string>, which aligns with expectations. However, if you define a record with a z.custom, such as z.record(z.custom<`0x${string}`>(), z.string()), instead of getting Record<`0x${string}`, string>, you actually end up with Record<`0x${string}`, string | undefined>.

You can test it with the snippet below:

const R1 = z.record(z.string(), z.string())
export type A1 = z.infer<typeof R1>

const R2 = z.record(z.custom<`0x${string}`>(), z.string())
export type A2 = z.infer<typeof R2>