Add proof-measure client + bump to 1.4.0

proof-measure is a separate, public, unauthenticated Dragonchain service. Adds:
- UnauthHttpClient: HMAC-free transport mirroring DragonchainClient (timeout,
  agent, redirect refusal).
- ProofMeasureClient: getSecurity / report / health; default base URL
  https://proof-measure.dragonchain.com. Standalone (new ProofMeasureClient())
  and via DragonchainSDK.proofMeasure.
- Proof-measure types (decimals as strings, timestamps as numbers).
- jest tests.

package.json

@@ -1,6 +1,6 @@
 {
   "name": "@dragonchain-inc/prime-sdk",
-  "version": "1.2.0",
+  "version": "1.4.0",
   "description": "Official Dragonchain Prime SDK for Node.js and TypeScript",
   "main": "./dist/index.js",
   "module": "./dist/index.mjs",