feat: update ethers@6

fix: bigint errors

fix: TS errors

fix: gasLimit fetch

fix: review comments

fix: contracts errors

chore: bump rc version

fix: revert wrong fix

fix: ts config

fix: ts config

fix: ts config

feat: update signer

package.json

@@ -1,6 +1,6 @@
 {
   "name": "@orionprotocol/sdk",
-  "version": "0.19.91",
+  "version": "0.19.92-rc0",
   "description": "Orion Protocol SDK",
   "main": "./lib/index.cjs",
   "module": "./lib/index.js",
@@ -91,7 +91,7 @@
     "bignumber.js": "^9.1.1",
     "bson-objectid": "^2.0.4",
     "buffer": "^6.0.3",
-    "ethers": "^5.6.2",
+    "ethers": "^6.7.1",
     "express": "^4.18.2",
     "isomorphic-ws": "^5.0.0",
     "just-clone": "^6.2.0",