NEAR support (#210)

* near: Add base types and methods

* chore: Review fixes

* near: Fix permission typo

* near: Add missing MerklePath

* near: Fix another permission typo

* near: Add missing implementations for MerklePathItem

This is needed because of the `class MerklePath extends
Array<MerklePathItem`.

The same had to be done for `Tuple` and `Value` in the `ethereum`
file/module.

AssemblyScript requires those implementations because of the
super class.

* ci: Add build script to catch compilation errors early

The `test` script was not catching these for some reason
that's probably related to how the AssemblyScript compiles
code and removes unnecessary things (needs further investigation).

For now it's very much helpful (and needed) to catch compilation
errors on the CI step.

* near: Change some fields from 'string' to 'bytes'

* global: Add near TypeIds

* Re-order fields to fix alignment issue

* near: AccountId -> Account

* near: Fix global type ids

Co-authored-by: Matthieu Vachon <matthieu.vachon@dfuse.io>

.travis.yml

@@ -3,3 +3,6 @@ node_js:
   - "12"
   - "14"
   - "16"
+script:
+  - yarn build
+  - yarn test