H-2205, H-2354: Implement multi-type entities in the graph

[TimDiekmann]

🌟 What is the purpose of this PR?

Multi-type entities enables entities to have multiple type without creating a new type.

🔍 What does this change?

• Change EntityTypeMetadata to store a vector of type ids
• Adjust Rust code to support taking multiple types for creating/updating/validating an entity
• Adjust the Node API to rewrite requests/responds to/from the graph to

Pre-Merge Checklist 🚀

🚢 Has this modified a publishable library?

This PR:

• does not modify any publishable blocks or libraries, or modifications do not need publishing

📜 Does this require a change to the docs?

The changes in this PR:

• are internal and do not require a docs change

🕸️ Does this require a change to the Turbo Graph?

The changes in this PR:

• do not affect the execution graph

⚠️ Known issues

• Querying entities with multiple entity types is not possible, yet, because structural queries do not support this.

🐾 Next steps

• Allow querying entities with multiple entity types: H-2351

🛡 What tests cover this?

• Every test which uses the Graph to deal with entities will use the newly written code

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 27 lines in your changes are missing coverage. Please review.

Project coverage is 27.52%. Comparing base (2f210f1) to head (c233069).
Report is 6 commits behind head on main.

Files	Patch %	Lines
.../@local/hash-subgraph/src/stdlib/subgraph/roots.ts	0.00%	14 Missing ⚠️
...s/hash-api/src/graph/knowledge/primitive/entity.ts	0.00%	9 Missing ⚠️
...-subgraph/tests/compatibility.test/map-vertices.ts	0.00%	2 Missing ⚠️
...hash-ai-worker-ts/src/activities/infer-entities.ts	0.00%	1 Missing ⚠️
...h-api/src/graph/knowledge/primitive/link-entity.ts	0.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #4140      +/-   ##
==========================================
- Coverage   27.56%   27.52%   -0.04%     
==========================================
  Files         278      278              
  Lines       11600    11613      +13     
  Branches     1174     1177       +3     
==========================================
- Hits         3197     3196       -1     
- Misses       8387     8401      +14     
  Partials       16       16              

Flag	Coverage Δ
apps.hash-ai-worker-ts	5.23% <0.00%> (-0.01%)	⬇️
apps.hash-api	0.00% <0.00%> (ø)
local.hash-backend-utils	9.01% <ø> (ø)
local.hash-subgraph	19.37% <0.00%> (-0.48%)	⬇️

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[CiaranMn]

🥳