Fix parsing of dependency notation URIs (#1570)

Fixes a thrown exception when path segments contain characters that
aren't URI safe (e.g. `import "@foo/bar baz.pkl"`).

Closes #1545

pkl-core/src/test/files/LanguageSnippetTests/input/projects/packageWithSpaces/PklProject

@@ -0,0 +1,8 @@
+amends "pkl:Project"
+
+package {
+  name = "packageWithSpaces"
+  baseUri = "package://localhost:0/packageWithSpaces"
+  version = "1.0.0"
+  packageZipUrl = "https://localhost:0/packageWithSpaces/packageWithSpaces-\(version).zip"
+}

pkl-core/src/test/files/LanguageSnippetTests/input/projects/packageWithSpaces/module with spaces.pkl

@@ -0,0 +1 @@
+foo = 1

pkl-core/src/test/files/LanguageSnippetTests/input/projects/project7/PklProject

@@ -0,0 +1,8 @@
+amends "pkl:Project"
+
+dependencies {
+  ["birds"] {
+    uri = "package://localhost:0/birds@0.7.0"
+  }
+  ["packageWithSpaces"] = import("../packageWithSpaces/PklProject")
+}

pkl-core/src/test/files/LanguageSnippetTests/input/projects/project7/PklProject.deps.json

@@ -0,0 +1,17 @@
+{
+  "schemaVersion": 1,
+  "resolvedDependencies": {
+    "package://localhost:0/birds@0": {
+      "type": "remote",
+      "uri": "projectpackage://localhost:0/birds@0.7.0",
+      "checksums": {
+        "sha256": "$skipChecksumVerification"
+      }
+    },
+    "package://localhost:0/packageWithSpaces@1": {
+      "type": "local",
+      "uri": "projectpackage://localhost:0/packageWithSpaces@1.0.0",
+      "path": "../packageWithSpaces/"
+    }
+  }
+}

pkl-core/src/test/files/LanguageSnippetTests/input/projects/project7/globWildcards.pkl

@@ -0,0 +1,3 @@
+import* "@birds/catalog/{Ostrich,Swallow}.pkl" as myCatalog
+
+res = myCatalog.keys

pkl-core/src/test/files/LanguageSnippetTests/input/projects/project7/spacesInImport.pkl

@@ -0,0 +1,3 @@
+import "@packageWithSpaces/module with spaces.pkl" as mod
+
+res = mod

pkl-core/src/test/files/LanguageSnippetTests/output/projects/packageWithSpaces/module with spaces.pcf

@@ -0,0 +1 @@
+foo = 1

pkl-core/src/test/files/LanguageSnippetTests/output/projects/project7/globWildcards.pcf

@@ -0,0 +1 @@
+res = Set("@birds/catalog/Ostrich.pkl", "@birds/catalog/Swallow.pkl")

pkl-core/src/test/files/LanguageSnippetTests/output/projects/project7/spacesInImport.pcf

@@ -0,0 +1,3 @@
+res {
+  foo = 1
+}