PR_REVIEW: added check for bidder name validity (#6491)

* added check for bidder name validity

* adding aliases in-scope for the validity check

PR_REVIEW.md

@@ -38,6 +38,10 @@ General gulp commands include separate commands for serving the codebase on a bu
 Documentation they're supposed to be following is https://docs.prebid.org/dev-docs/bidder-adaptor.html
 
 Follow steps above for general review process. In addition, please verify the following:
+- Verify the biddercode and aliases are valid:
+    - Lower case alphanumeric with the only special character allowed is underscore.
+    - The bidder code should be unique for the first 6 characters
+    - Reserved words that cannot be used as bidder names: all, context, data, general, prebid, and skadn
 - Verify that bidder has submitted valid bid params and that bids are being received.
 - Verify that bidder is not manipulating the prebid.js auction in any way or doing things that go against the principles of the project. If unsure check with the Tech Lead.
 - Verify that code re-use is being done properly and that changes introduced by a bidder don't impact other bidders.