feat: add Secp256k1 support to solana-web3.js (#12958)

* feat: add secp256k1 instruction

* feat: use buffer-layout for encoding as well

* style: use consistent naming for types

* style: update typings and make program functions static

* fix: attempt to resolve rollup issue

* fix: expose sysvar in typings

* fix: remove decode instruction functionality (for now)

web3.js/rollup.config.js

@@ -106,6 +106,8 @@ function generateConfig(configType) {
         'superstruct',
         'tweetnacl',
         'url',
+        'secp256k1',
+        'keccak',
       ];
       break;
     default: