[Plugin Framework] Support v1.2.0

[t0yv0]

Hello!

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Issue details

https://github.com/hashicorp/terraform-plugin-framework/releases/tag/v1.2.0

Notably since TFPF v1.2.0 now introduces statically discoverable default values, instead of having every provider implement their own opaque modifier for the purpose, it presents an opportunity for the bridge to recover this default information during schema generation time and record it in Pulumi Package Schema.

Affected area/feature

[t0yv0]

@mikhailshilkov I think it's time to put this in the iteration; the latest version is 1.3.x and we have customers upgrading ahead of the bridge. Would be good to read all the upstream release notes and see if we spot any feature gaps so we proactively discover those.

[t0yv0]

CC @iwahbe