test: Make all minecraft methods public during testing

This is meant to fix minecraft failing to access package private methods of itself due to changes in naming

testagent/build.gradle.kts

@@ -0,0 +1,14 @@
+plugins {
+	java
+	alias(libs.plugins.shadow)
+}
+dependencies {
+	implementation(libs.asm)
+}
+tasks.withType<Jar> {
+	val agentMain = "moe.nea.firmament.testagent.AgentMain"
+	manifest.attributes(
+		"Agent-Class" to agentMain,
+		"Premain-Class" to agentMain,
+	)
+}