Remove Indy/Vdrtools

[gmulhearn]

Closes #1250

Other changes

I believe switching the pipelines has caused a whole lot of new tests to run in askar mode, so there's plenty of new test failures.

• in aries_vcx, add support for expanding verkeys read from ledgers (abbreviated with ~ prefix, expanded into full verkey)
• rm mysql wallet tests for now, i don't believe these ever worked for askar, we may need to look into it if we want to support it
• askar wallet verify function only worked if the signer key is owned by the wallet; not useful for verify external signers
• change the from_seed to from_secret_bytes in askar key generation (similar to fix: generate dids from indy seed secret bytes #1224 ), however i've taken the easy path out by just swapping it in-place
• small issues with the unpack alg, where the reported sender_vk was missing 1 step of base58 decoding.
• just using a dummy in-memory askar wallet for tests/agents currently. i left a TODO comment, but i think we can defer this for solving later, it will require consideration of how we want to make storage path configurable (previously we just let indy select some default location)
• pin the mediator build image to our globally used rust toolchain version (1.79)

[gmulhearn]

AATH status:

• VCX <-> VCX

Failing scenarios:
  features/0160-connection.feature:52  Inviter Sends invitation for one agent second agent tries after connection
  features/0160-connection.feature:69  Inviter Sends invitation for one agent second agent tries during first share phase
  features/0793-peer-did.feature:31  Establish a connection with DID Exchange between two agents utilizing qualified did:peer DIDs -- @1.2 
  features/0793-peer-did.feature:55  Establish a connection with DID Exchange between two agents utilizing qualified did:peer DIDs with responder not set to send qualified Peer DIDs -- @1.1 
  features/0793-peer-did.feature:79  Establish a connection with DID Exchange between two agents utilizing qualified did:peer DIDs with responder set to send a different Peer DID method -- @1.2 

3 features passed, 3 failed, 9 skipped
29 scenarios passed, 5 failed, 126 skipped
252 steps passed, 5 failed, 1126 skipped, 0 undefined
Took 8m33.934s

• VCX <-> ACAPY
  Struggling to set up full environment, but i sampled all 4 RFC0036 tests we enrol in, and they are passing