Add getLibraryPaths(), getIncludePaths(), getSystemIncludePaths() methods to Ndk struct, make existing code utilize them

[silbinarywolf]

Why do this?

We should enable consumers of this SDK to get those paths themselves if they need them.

What to add

Not sure if there is a more conventional Zig name for the following functions but I imagine it returning []LazyPath for each. Would likely need the compile target passed in as a bare minimum.

• Add getLibraryPaths()
• Add getIncludePaths()
• Add getSystemIncludePaths()

What prompted this?

Translate-C as an external dependency didn't work until I added it recently in this PR: #92, We should enable consumers of this SDK to get those paths themselves if they need them.

it might be preferable to add a public API to get the include paths for a given target.
From: #91