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Support Asynchronous Writing Datastores

interface(Datastore): added Sync function to the Datastore, along with implementations in helper Datastores

add a Size field to Query's Result

query: allow to always request the size alongside KeysOnly, allow impl to always return the size if no perf cost

Rational is that some datastore can easilty get the size of a value when
listing only keys, so we might as well have a way to pass that. One way this
could be useful is when implementing a cache for Has/GetSize.

Add clarifying comments on Query#String()

License: MIT
Signed-off-by: Jakub Sztandera <kubuxu@protocol.ai>

Add a large test suite

Make it possible to print datastore queries.

doc: add a lead maintainer

feat: make not-found errors discoverable

Now we just need a common place to put:

func IsNotFound(e error) bool {
  for e != nil {
    if ne, ok := e.(interface { NotFound() bool }); ok {
      return ne.NotFound()
    }
    if ue, ok := e.(interface { Unwrap() error }); ok {
      e = ue.Unwrap()
    } else {
      return false
    }
  }
  return false
}

feat: make delete idempotent

fixes #104

Misc Typo Fixes

MapDatastore: obey KeysOnly

fix the keytransform datastore's query implementation

We use this datastore in tests all the time so it should match the behavior of
_actual_ datastores as much as possible.