Partial temporary revert of 8b26393163
(keeping a test that can be kept).
The validation is currently preventing the use of `id` as an output
property for packaged components (i.e. MLCs), which wasn't originally
considered when adding this validation. We do want to be able to support
`id` properties for components, so when we do subsequently add back the
validation, we'll do so in a way that doesn't prevent that.
Part of #15024
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# Description
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Fixes https://github.com/pulumi/pulumi/issues/14631.
This adds a couple of new tests to codegen. Firstly to check that if you
use "urn" or "id" as a resource output property we fail schema binding.
This is because these clash with the urn and id fields that every
resource already has to have.
Secondly a schema gen test that checks that urn and id _do_ work in
other places, i.e. resource inputs, nested types, etc.
## Checklist
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These changes extend the public API of `pkg/codegen/schema` to support
on-demand binding of package members. On-demand binding is appropriate for
scenarios that do not require the entire package, especially those such as
program code generation or the YAML LSP server that require only specific
types/functions/etc.
The extensions to the public API consist of two new types and several new
methods. The most notable of these are `PackageReference` and
`Loader.LoadPackageReference`. The former provides the on-demand binding
interface, while the latter creates instances of the former (n.b. it was
my intent to make a breaking change to the signature of `Loader.LoadPackage`
s.t. it returns a `PackageReference`, but the circular dependency between
this Go module and those for YAML and Java prevented that change).
These changes _dramatically_ reduce the memory required to interace with
Pulumi Packages, and only require memory proportional to the number of
accessed package members. We may be able to improve on this in the future
by removing type/resource/function interning, which would allow those
values to be garbage collected at a granaular level rather than at a
package level. That is a more radical change, though, as it requires new
equality semantics for each of the affected types (some of which are
currently used as map keys).