Azure Key Vault integration for storage of Tessera public/private key pairs

[chris-j-h]

Added features

1. Option to save newly generated keys to a preconfigured Azure Key Vault
2. Retrieve keys from an Azure Key Vault so that they do not have to be stored locally

Main areas of interest

• key-vault modules: Connecting to the Azure service and providing the means to store and retrieve keys
• config modules: Adding further config items and corresponding validation
• key-generation module: Storing keys in vault after generation

[codecov-io]

Codecov Report

Merging #483 into master will decrease coverage by 0.1%.
The diff coverage is 97.35%.

@@             Coverage Diff              @@
##             master     #483      +/-   ##
============================================
- Coverage     99.48%   99.38%   -0.11%     
- Complexity     1195     1260      +65     
============================================
  Files           206      217      +11     
  Lines          3914     4070     +156     
  Branches        201      213      +12     
============================================
+ Hits           3894     4045     +151     
- Misses            0        5       +5     
  Partials         20       20

Impacted Files	Coverage Δ	Complexity Δ
...um/tessera/key/generation/KeyGeneratorFactory.java	100% <ø> (ø)	1 <0> (ø)	⬇️
...rc/main/java/com/quorum/tessera/config/Config.java	100% <ø> (ø)	12 <0> (ø)	⬇️
...tessera/key/vault/AzureKeyVaultClientDelegate.java	0% <0%> (ø)	0 <0> (?)
...ssera/config/adapters/KeyConfigurationAdapter.java	95.23% <100%> (ø)	7 <0> (ø)	⬇️
...onfig/constraints/UnsupportedKeyPairValidator.java	100% <100%> (ø)	12 <1> (+2)	⬆️
...essera/config/cli/parsers/KeyGenerationParser.java	96.29% <100%> (+1.29%)	10 <5> (+2)	⬆️
...essera/key/vault/VaultSecretNotFoundException.java	100% <100%> (ø)	1 <1> (?)
...tessera/key/generation/AzureVaultKeyGenerator.java	100% <100%> (ø)	6 <6> (?)
...rum/tessera/config/keypairs/AzureVaultKeyPair.java	100% <100%> (ø)	7 <7> (?)
...a/com/quorum/tessera/config/JaxbConfigFactory.java	100% <100%> (ø)	12 <2> (ø)	⬇️
... and 29 more

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