Adds support for understanding both Maps and Arrays
Irritatingly, whilst arrays are mostly serialized as lists, we cannot simply use a restricted List reader to deserialize them because there are subtle differences in the way we need to work out if its actually a restricted type or not. Rather than add a bunch of random logic into the factory method I've isolated it in the class hierarchy. So a little bit more code makes the implementations a lot neater. We also need to deal with the fact arras of unboxed primitives exist, which whilst Java really gets excited about, we don't need to care about. An int, is an int, is an int!.
Map support required we add a slightly better Value dumper, essentially the "key" component of the KV pair needs to be more flexible than a simple string when we're dumping out param:value pairs.
Testing
Added a lot more unit tests to both the ordered type notation code to ensure we build up the schema dependency struct in the correct order. Quite important as we rely on that in the composite factory to be strictly ordered to ensure we're not constructing a reader for a type we don't yet understand... and there were some small bugs in the version that predates this PR
Also added a lot higher level tests to ensure actual reading out of the blob works
The Blob Writer is a small kotlin app that allows arbitrary things to be serialized and then those bytes written to a file, quite useful for working on non JVM parsing of such things.
Along a similar vein, add a schema dumper alongside the blob-inspector to highlight the contents of the header
