lang: Fix using defined types in instruction parameters with `declare_program!`

[acheroncrypto]

Problem

Using the generated IDL from the following instruction

pub fn defined(ctx: Context<Defined>, my_type: MyType) -> Result<()> {
    Ok(())
}

with declare_program! results in a compilation error due to MyType not being imported in the generated cpi module.

Summary of changes

Globally import accounts, events and types modules in necessary places to not run into compilation errors which are difficult to debug.

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[cryptopapi997]

Thank you for this PR! This is a blocker for us, as it means we can't use declare_program! in our codebase even though we'd love to. Do you plan to release this patch as a minor release? Or will we have to wait for the next major release for this?

[acheroncrypto]

We'll most likely make a patch release, but there are a couple more fixes/improvements queued up that I'd like to get in before then.