Aas-middleware

**Improvements:**

- Improved speed of loading large amount of instances in data models

**Bug fixes:**

- Removed some bugs in the graphql router for optional list attributes

Bug Fixes:

- Graphql Router with optional primitive attributes

**Improvements:**
- dramatic speed improvement for data model with hashing

**Bug fixes:**
- graphql router
- synchronization of contained models
- models validation
- bug fix in infering aas structure

This pre-release contains bug fixes and updates in the feature set.

Features:

- Working GraphQL app
- Integration of Mappers and Formatters in the middleware to automatically translate between connectors / workflows and the persistence schema

Bug Fixes:
- Assertions that connector and persistence values are the same

This tag is the first pre-release tag with a list of finished features:
- architecture rebuild from aas2openapi to the architecture of aas-middleware
- fully tested Data Model, formatting, rest endpoint
- running connectors for different industrial protocols and basyx server
- partially running graphql endpoint
- running workflows