tf5muxserver+tf6muxserver: Remove resource schema caching

Reference: #168

This change removes the `GetProviderSchema` RPC-based caching logic in `NewMuxServer` and directly calls the underlying providers within that RPC. To fully support the removal of resource schema caching, the `PlanResourceChange` logic for checking the `ProposedNewState` data for a destroy plan was optimized to no longer require decoding the data with the type information.

For larger scale providers (either number of resources and/or resources with large schemas), this should reduce resident memory utilization with little performance penalty.

.changes/unreleased/BUG FIXES-20230627-134839.yaml

@@ -0,0 +1,6 @@
+kind: BUG FIXES
+body: 'tf5muxserver: Removed unnecessary resource schema caching, which reduces resident
+  memory utilization'
+time: 2023-06-27T13:48:39.01979-04:00
+custom:
+  Issue: "168"

.changes/unreleased/BUG FIXES-20230627-134907.yaml

@@ -0,0 +1,6 @@
+kind: BUG FIXES
+body: 'tf6muxserver: Removed unnecessary resource schema caching, which reduces resident
+  memory utilization'
+time: 2023-06-27T13:49:07.303269-04:00
+custom:
+  Issue: "168"

go.mod

@@ -4,7 +4,7 @@ go 1.19
 
 require (
 	github.com/google/go-cmp v0.5.9
-	github.com/hashicorp/terraform-plugin-go v0.16.0
+	github.com/hashicorp/terraform-plugin-go v0.16.1-0.20230627170012-6f0f2df12a0c
 	github.com/hashicorp/terraform-plugin-log v0.9.0
 )
 
@@ -27,6 +27,6 @@ require (
 	golang.org/x/sys v0.9.0 // indirect
 	golang.org/x/text v0.10.0 // indirect
 	google.golang.org/genproto v0.0.0-20230410155749-daa745c078e1 // indirect
-	google.golang.org/grpc v1.56.0 // indirect
-	google.golang.org/protobuf v1.30.0 // indirect
+	google.golang.org/grpc v1.56.1 // indirect
+	google.golang.org/protobuf v1.31.0 // indirect
 )

go.sum

@@ -15,8 +15,8 @@ github.com/hashicorp/go-plugin v1.4.10 h1:xUbmA4jC6Dq163/fWcp8P3JuHilrHHMLNRxzGQ
 github.com/hashicorp/go-plugin v1.4.10/go.mod h1:6/1TEzT0eQznvI/gV2CM29DLSkAK/e58mUWKVsPaph0=
 github.com/hashicorp/go-uuid v1.0.3 h1:2gKiV6YVmrJ1i2CKKa9obLvRieoRGviZFL26PcT/Co8=
 github.com/hashicorp/go-uuid v1.0.3/go.mod h1:6SBZvOh/SIDV7/2o3Jml5SYk/TvGqwFJ/bN7x4byOro=
-github.com/hashicorp/terraform-plugin-go v0.16.0 h1:DSOQ0rz5FUiVO4NUzMs8ln9gsPgHMTsfns7Nk+6gPuE=
-github.com/hashicorp/terraform-plugin-go v0.16.0/go.mod h1:4sn8bFuDbt+2+Yztt35IbOrvZc0zyEi87gJzsTgCES8=
+github.com/hashicorp/terraform-plugin-go v0.16.1-0.20230627170012-6f0f2df12a0c h1:NNmbDRyK6bPyV+1N1B3WSFa8XP0/jWFz5rPvROaCu+E=
+github.com/hashicorp/terraform-plugin-go v0.16.1-0.20230627170012-6f0f2df12a0c/go.mod h1:l7VK+2u5Kf2y+A+742GX0ouLut3gttudmvMgN0PA74Y=
 github.com/hashicorp/terraform-plugin-log v0.9.0 h1:i7hOA+vdAItN1/7UrfBqBwvYPQ9TFvymaRGZED3FCV0=
 github.com/hashicorp/terraform-plugin-log v0.9.0/go.mod h1:rKL8egZQ/eXSyDqzLUuwUYLVdlYeamldAHSxjUFADow=
 github.com/hashicorp/terraform-registry-address v0.2.1 h1:QuTf6oJ1+WSflJw6WYOHhLgwUiQ0FrROpHPYFtwTYWM=
@@ -60,12 +60,12 @@ golang.org/x/text v0.10.0/go.mod h1:TvPlkZtksWOMsz7fbANvkp4WM8x/WCo/om8BMLbz+aE=
 golang.org/x/xerrors v0.0.0-20191204190536-9bdfabe68543/go.mod h1:I/5z698sn9Ka8TeJc9MKroUUfqBBauWjQqLJ2OPfmY0=
 google.golang.org/genproto v0.0.0-20230410155749-daa745c078e1 h1:KpwkzHKEF7B9Zxg18WzOa7djJ+Ha5DzthMyZYQfEn2A=
 google.golang.org/genproto v0.0.0-20230410155749-daa745c078e1/go.mod h1:nKE/iIaLqn2bQwXBg8f1g2Ylh6r5MN5CmZvuzZCgsCU=
-google.golang.org/grpc v1.56.0 h1:+y7Bs8rtMd07LeXmL3NxcTLn7mUkbKZqEpPhMNkwJEE=
-google.golang.org/grpc v1.56.0/go.mod h1:I9bI3vqKfayGqPUAwGdOSu7kt6oIJLixfffKrpXqQ9s=
+google.golang.org/grpc v1.56.1 h1:z0dNfjIl0VpaZ9iSVjA6daGatAYwPGstTjt5vkRMFkQ=
+google.golang.org/grpc v1.56.1/go.mod h1:I9bI3vqKfayGqPUAwGdOSu7kt6oIJLixfffKrpXqQ9s=
 google.golang.org/protobuf v1.26.0-rc.1/go.mod h1:jlhhOSvTdKEhbULTjvd4ARK9grFBp09yW+WbY/TyQbw=
 google.golang.org/protobuf v1.26.0/go.mod h1:9q0QmTI4eRPtz6boOQmLYwt+qCgq0jsYwAQnmE0givc=
-google.golang.org/protobuf v1.30.0 h1:kPPoIgf3TsEvrm0PFe15JQ+570QVxYzEvvHqChK+cng=
-google.golang.org/protobuf v1.30.0/go.mod h1:HV8QOd/L58Z+nl8r43ehVNZIU/HEI6OcFqwMG9pJV4I=
+google.golang.org/protobuf v1.31.0 h1:g0LDEJHgrBl9N9r17Ru3sqWhkIx2NB67okBHPwC7hs8=
+google.golang.org/protobuf v1.31.0/go.mod h1:HV8QOd/L58Z+nl8r43ehVNZIU/HEI6OcFqwMG9pJV4I=
 gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
 gopkg.in/yaml.v3 v3.0.0-20200313102051-9f266ea9e77c/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM=
 gopkg.in/yaml.v3 v3.0.1 h1:fxVm/GzAzEWqLHuvctI91KS9hhNmmWOoWu0XTYJS7CA=