feat(compiler): add ResolvableVariableSnapshot for variable tracking #…

…178

Introduce ResolvableVariableSnapshot to store variable change flow during compilation. Includes a manager class for handling snapshots.

shirelang/src/main/kotlin/com/phodal/shirelang/compiler/template/ResolvableVariableSnapshot.kt

@@ -0,0 +1,28 @@
+package com.phodal.shirelang.compiler.template
+
+import com.intellij.openapi.util.UserDataHolderBase
+
+/**
+ * Variable Snapshot will store all change flow of a variable. For example:
+ * ```shire
+ * ---
+ * variables:
+ *   "controllers": /.*.java/ { cat | grep("class\s+([a-zA-Z]*Controller)")  }
+ * ---
+ * ```
+ *
+ * The variable snapshot should store:
+ *
+ * - the value after cat function
+ * - the value after grep function
+ */
+class ResolvableVariableSnapshot(
+    val variableName: String,
+) : UserDataHolderBase() {
+
+}
+
+
+class ResolvableVariableSnapshotManager {
+
+}