[2.x] Add instruction bundles

Tracking the instruction bundles feature progress here.

This adds the following nodes:

InstructionBundleNode - an optional array of those sits on each ProgramNode
InstructionAccountLinkNode - allows us to link to an instruction account (for overriding)
InstructionArgumentLinkNode - allows us to link to an instruction argument (for overriding)
InstructionLinkNode - allows us to link to an instruction, to include them in a bundle
InstructionAccountOverrideNode - Provides a way to override an account (e.g to provide one account to multiple instructions at once or to set sensible defaults)
InstructionArgumentOverrideNode - Provides a way to override an argument (e.g to provide one argument to multiple instructions at once or to set sensible defaults)

There is also a change to AccountLinkNode, PdaLinkNode: An added program?: ProgramLinkNode optional argument (because in the context of having bundles we need to be able to refer to those in other programs). This should be a backwards compatible change since it's optional. The default behavior will be to look in the context of the current program.

Next steps:

[x] Nodes & node types
[ ] Visitors
[ ] JS Renderer
[ ] Rust Renderer
[ ] Nested bundles? (probably in a separate PR)

I'm planning to use createToken & initializeAccount as an example to test again in the renderers.

codama-idl / codama

[2.x] Add instruction bundles #143

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