feat: opt-in in-process RPC cache for development (RPC_CACHE=true)

Author: apexearth

.gitignore

@@ -6,6 +6,7 @@
 /data
 /cache
 /out
+/.rpc-cache
 
 /**Versions.json
 

package.json

@@ -72,6 +72,7 @@
     "@subsquid/evm-typegen": "^5.0.0",
     "@subsquid/typeorm-codegen": "^2.2.0",
     "@trivago/prettier-plugin-sort-imports": "^4.2.0",
+    "@types/better-sqlite3": "^7.6.13",
     "@types/chai": "^4.3.11",
     "@types/js-yaml": "^4.0.8",
     "@types/mocha": "^10.0.6",
@@ -84,6 +85,7 @@
     "@types/websocket": "^1.0.10",
     "@typescript-eslint/eslint-plugin": "^8.26.0",
     "@typescript-eslint/parser": "^8.26.0",
+    "better-sqlite3": "^12.10.0",
     "cross-env": "^7.0.3",
     "eslint": "^9.21.0",
     "glob": "^10.3.10",