Vega transaction checker

A simple tool to check Vega transacton JSON.

Features

Validates JSON is well formed and parses, attempts to show the error in context if not.
Encodes the JSON using https://www.npmjs.com/package/@vegaprotocol/protos and shows any errors.
Re-serialises the encoded data as JSON and shows a diff between this and the original input, which often highlights missing or unexpected fields in the input.
Encodes the input data in the URL hash for ease of sharing.
Autocompletes and provides documentation tooltips for most commands.
Diffs market updates against latest enacted proposal to allow analysis of the impact of a market change proposal prior to submission.

Serialising the encoded data to JSON doesn't always produce the format expected by the wallet etc. This now only occurs in a few cases like arguments for EVM contracts in oracle specs, and base64 encoded fields.
Validation errors found by the protobuf encoder don't provider a location/field name and therefore lack much in the way of useful context.
The URLs with encoded data in the hash are very long. Often too long to share on Slack or even use with URL shorteners.

Fix JSON encoding (hopefully via upstream library enhancement).
Alternative and less unwieldy content-addressable sharing system.
Call tx check endpoint on data node to provide more detailed and helpful validation.
Ability to submit transactons.
Support for linter style rules to provide additional help.
Form-powered templates to speed up and simplify creation of transactions.
Ability to download and copy data from a data node when making modification transactions.