Add ephemeral resources as invokes

[Frassle]

A (probably better) alternative to #3227. Terraform treats ephemeral resources more like data sources, so rather than exposing these as resources this PR exposes them as invokes.

Questions

1. Are we ok just keeping track of private state and renewals within the bridge process? Seems to work fine, and the engine does promise providers can be stateful.

[codecov]

Codecov Report

❌ Patch coverage is 59.76096% with 101 lines in your changes missing coverage. Please review.
✅ Project coverage is 69.67%. Comparing base (4c91969) to head (bbe2da4).

Files with missing lines	Patch %	Lines
pkg/pf/tfbridge/provider_invoke.go	62.31%	18 Missing and 8 partials ⚠️
...g/pf/internal/schemashim/ephemeral_resource_map.go	42.42%	19 Missing ⚠️
pkg/pf/tfbridge/naming.go	0.00%	12 Missing ⚠️
pkg/pf/proto/protov6.go	0.00%	6 Missing ⚠️
pkg/pf/tfbridge/provider_ephemeral_resources.go	76.00%	3 Missing and 3 partials ⚠️
pkg/tfbridge/info/info.go	25.00%	5 Missing and 1 partial ⚠️
pkg/convert/encoding.go	66.66%	2 Missing and 2 partials ⚠️
pkg/pf/tfbridge/provider.go	77.77%	2 Missing and 2 partials ⚠️
pkg/pf/internal/pfutils/ephemeral_resources.go	88.46%	2 Missing and 1 partial ⚠️
pkg/pf/proto/runtypes.go	50.00%	2 Missing and 1 partial ⚠️
... and 6 more

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #3229      +/-   ##
==========================================
+ Coverage   68.62%   69.67%   +1.05%     
==========================================
  Files         338      340       +2     
  Lines       44181    36684    -7497     
==========================================
- Hits        30318    25559    -4759     
+ Misses      12128     9371    -2757     
- Partials     1735     1754      +19     

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