fix(transform-eventual-send)!: remove old-SES code, build step

This removes `@agoric/transform-eventual-send/src/rewriter`, which was used
to build a tildot transformation function that fit into the old-SES Realm
`transforms` option. Now that we're using new SES, it is no longer needed.
The unit test which exercised it was removed too, in favor of one that simply
tests the core string-to-string transform function.

This also removes the `yarn build` step, which used `rollup` to create a
single-file distribution bundle. We're removing these bundle steps across the
codebase.

packages/transform-eventual-send/package.json

@@ -7,20 +7,13 @@
     "test": "tape -r esm 'test/**/*.js'",
     "lint-fix": "eslint --fix '**/*.js'",
     "lint-check": "eslint '**/*.js'",
-    "build": "node -r esm ./scripts/build-esend.js"
+    "build": "exit 0"
   },
   "devDependencies": {
     "@agoric/acorn-eventual-send": "^2.0.5",
     "@agoric/babel-parser": "^7.6.4",
-    "@agoric/bundle-source": "^1.1.5",
-    "@agoric/eventual-send": "^0.9.2",
-    "@agoric/harden": "^0.0.8",
     "@babel/generator": "^7.5.0",
-    "astring": "^1.4.0",
     "esm": "^3.2.5",
-    "rollup": "^1.16.6",
-    "rollup-plugin-node-resolve": "^5.2.0",
-    "ses": "^0.6.5",
     "tap-spec": "^5.0.0",
     "tape": "^4.9.2",
     "tape-promise": "^4.0.0"