feat(flow): add types for every plan enum variant (#3938)

* feat: Plan with types

* chore: per review advices

Cargo.lock

@@ -3824,6 +3824,7 @@ dependencies = [
  "minstant",
  "nom",
  "num-traits",
+ "pretty_assertions",
  "prost 0.12.4",
  "query",
  "serde",
@@ -7364,6 +7365,16 @@ dependencies = [
  "termtree",
 ]
 
+[[package]]
+name = "pretty_assertions"
+version = "1.4.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "af7cee1a6c8a5b9208b3cb1061f10c0cb689087b3d8ce85fb9d2dd7a29b6ba66"
+dependencies = [
+ "diff",
+ "yansi",
+]
+
 [[package]]
 name = "prettydiff"
 version = "0.6.4"
@@ -12603,6 +12614,12 @@ dependencies = [
  "linked-hash-map",
 ]
 
+[[package]]
+name = "yansi"
+version = "0.5.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "09041cd90cf85f7f8b2df60c646f853b7f535ce68f85244eb6731cf89fa498ec"
+
 [[package]]
 name = "zerocopy"
 version = "0.7.34"