Support scheme-agnostic projects (#486)

This adds changes to support loading project dependencies in non-file based projects.

The design for this feature can be found in SPICE-0005: https://github.com/apple/pkl-evolution/pull/6

Changes:
* Consider all imports prefixed with `@` as dependency notation.
* Bugfix: fix resolution of glob expressions in a local dependency.
* Adjust pkl.Project:
  - Allow local dependencies from a scheme-local paths.
  - Disallow certain evaluator settings if not loaded as a file-based module.
* Breaking API change: `ProjectDependenciesManager` constructor now requires `ModuleResolver` and `SecurityManager`.

pkl-core/src/test/resources/org/pkl/core/project/project5/PklProject

@@ -0,0 +1,8 @@
+amends "pkl:Project"
+
+dependencies {
+  ["fruit"] {
+    uri = "package://localhost:0/fruit@1.0.5"
+  }
+  ["project4"] = import("../project4/PklProject")
+}

pkl-core/src/test/resources/org/pkl/core/project/project5/PklProject.deps.json

@@ -0,0 +1,17 @@
+{
+  "schemaVersion": 1,
+  "resolvedDependencies": {
+    "package://localhost:0/fruit@1": {
+      "type": "remote",
+      "uri": "projectpackage://localhost:0/fruit@1.0.5",
+      "checksums": {
+        "sha256": "$skipChecksumVerification"
+      }
+    },
+    "package://localhost:0/project4@1": {
+      "type": "local",
+      "uri": "projectpackage://localhost:0/project4@1.0.0",
+      "path": "../project4"
+    }
+  }
+}

pkl-core/src/test/resources/org/pkl/core/project/project5/main.pkl

@@ -0,0 +1,5 @@
+import "@fruit/catalog/apple.pkl"
+import "@project4/module1.pkl"
+
+prop1 = apple
+prop2 = module1

pkl-core/src/test/resources/org/pkl/core/project/project6/PklProject

@@ -0,0 +1,5 @@
+amends "pkl:Project"
+
+dependencies {
+  ["project7"] = import("../project7/PklProject")
+}

pkl-core/src/test/resources/org/pkl/core/project/project6/PklProject.deps.json

@@ -0,0 +1,10 @@
+{
+  "schemaVersion": 1,
+  "resolvedDependencies": {
+    "package://localhost:0/project7@1": {
+      "type": "local",
+      "uri": "projectpackage://localhost:0/project7@1.0.0",
+      "path": "../project7"
+    }
+  }
+}

pkl-core/src/test/resources/org/pkl/core/project/project6/globIntoDependency.pkl

@@ -0,0 +1,3 @@
+import* "@project7/*.pkl" as proj7Files
+
+res = proj7Files

pkl-core/src/test/resources/org/pkl/core/project/project6/globWithinDependency.pkl

@@ -0,0 +1,3 @@
+import "@project7/main.pkl"
+
+res = main.res

pkl-core/src/test/resources/org/pkl/core/project/project7/PklProject

@@ -0,0 +1,8 @@
+amends "pkl:Project"
+
+package {
+  name = "project7"
+  version = "1.0.0"
+  packageZipUrl = "https://bogus.value"
+  baseUri = "package://localhost:0/project7"
+}

pkl-core/src/test/resources/org/pkl/core/project/project7/main.pkl

@@ -0,0 +1 @@
+res = import*("*.pkl")