Enable retrieval of previous versions of Azure secrets

[chris-j-h]

As an alternative to the solution outlined in Issue 570, this will improve Azure support by allowing Tessera to retrieve previous versions of secrets. If no version is provided in the Tessera configfile then the latest version is retrieved by default.

This means that even if secrets are updated the previous values are not lost and Tessera can continue to use the older keys.

[codecov-io]

Codecov Report

Merging #574 into master will decrease coverage by 0.01%.
The diff coverage is 97.95%.

@@             Coverage Diff              @@
##             master     #574      +/-   ##
============================================
- Coverage     99.45%   99.43%   -0.02%     
- Complexity     1627     1643      +16     
============================================
  Files           255      256       +1     
  Lines          4953     4991      +38     
  Branches        246      247       +1     
============================================
+ Hits           4926     4963      +37     
- Misses            4        5       +1     
  Partials         23       23

Impacted Files	Coverage Δ	Complexity Δ
...a/key/vault/azure/AzureKeyVaultClientDelegate.java	50% <0%> (-10%)	1 <0> (ø)
...tessera/key/generation/AzureVaultKeyGenerator.java	100% <100%> (ø)	6 <0> (ø)	⬇️
.../tessera/config/vault/data/AzureGetSecretData.java	100% <100%> (ø)	4 <2> (+1)	⬆️
...rum/tessera/config/keypairs/AzureVaultKeyPair.java	100% <100%> (ø)	9 <3> (+2)	⬆️
.../tessera/key/vault/azure/AzureKeyVaultService.java	100% <100%> (ø)	7 <0> (ø)	⬇️
...um/tessera/config/keypairs/UnsupportedKeyPair.java	100% <100%> (ø)	32 <5> (+4)	⬆️
...c/main/java/com/quorum/tessera/config/KeyData.java	100% <100%> (ø)	30 <5> (+4)	⬆️
...config/constraints/AzureVaultKeyPairValidator.java	100% <100%> (ø)	5 <5> (?)
...quorum/tessera/config/adapters/KeyDataAdapter.java	97.33% <100%> (+0.23%)	18 <0> (ø)	⬇️
...rum/tessera/keypairconverter/KeyPairConverter.java	100% <100%> (ø)	5 <0> (ø)	⬇️
... and 1 more

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