Figure out what do to about abandonware async arango clients

[MrCreosote]

We're currently using https://github.com/mirrorrim/aioarango for ArangoDB comms, but that repo hasn't been updated in almost 2 years. Questions about that are going unanswered: mirrorrim/aioarango#3 mirrorrim/aioarango#5
The main client repo has no plans to support async/await: arangodb/python-arango#95
The only other async lib I can find also appears to be abandonware: https://github.com/getflaps/aioarangodb

The whole service is structured around async/await and undoing that would be painful and also probably lead to a performance hit on longer queries.

Currently it's not causing any problems, but some library dependencies are locked to specific major versions and so we won't be able to update those packages once they do a major release:

aioarango==1.0.0
  - httpx [required: >=0.18.2,<0.19.0, installed: 0.18.2]
    - certifi [required: Any, installed: 2022.12.7]
    - httpcore [required: >=0.13.3,<0.14.0, installed: 0.13.7]
      - anyio [required: ==3.*, installed: 3.6.2]
        - idna [required: >=2.8, installed: 3.4]
        - sniffio [required: >=1.1, installed: 1.3.0]
      - h11 [required: >=0.11,<0.13, installed: 0.12.0]
      - sniffio [required: ==1.*, installed: 1.3.0]
    - rfc3986 [required: >=1.3,<2, installed: 1.5.0]
    - sniffio [required: Any, installed: 1.3.0]
  - PyJWT [required: >=2.1.0,<3.0.0, installed: 2.6.0]
  - requests-toolbelt [required: >=0.9.1,<0.10.0, installed: 0.9.1]
    - requests [required: >=2.0.1,<3.0.0, installed: 2.28.2]
      - certifi [required: >=2017.4.17, installed: 2022.12.7]
      - charset-normalizer [required: >=2,<4, installed: 2.1.1]
      - idna [required: >=2.5,<4, installed: 3.4]
      - urllib3 [required: >=1.21.1,<1.27, installed: 1.26.14]

For example, httpx is now on version 0.23.3 (mirrorrim/aioarango#7)

[MrCreosote]

I suppose on the dependency front we could go back to pip... meh

[MrCreosote]

another nasty option would be to pull out the code we need from aioarango (which is probably a relatively small subset) into this repo. Then we can set the dependency levels to whatever we want & update code as necessary to make them work.

[MrCreosote]

We currently can't update to urllib3 because aioarango requires requests-toolblet < 0.10.0, and anything < 1.0.0 is not compatible with urllib3 >= 2.0