feat: get secrets by versionId or versionStage (#19)

[ThirdEyeSqueegee]

Issue #, if available:
#19

Description of changes:

• Add optional versionId and versionStage args to GetSecretString and GetSecretBinary to allow retrieving secrets by version ID or version stage

By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 license.

[codecov]

Codecov Report

❌ Patch coverage is 72.41379% with 8 lines in your changes missing coverage. Please review.
✅ Project coverage is 87.65%. Comparing base (db8a853) to head (36a08ac).

Files with missing lines	Patch %	Lines
.../secretsmanager/caching/cache/SecretCacheItem.java	52.94%	5 Missing and 3 partials ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##                 v2     #153      +/-   ##
============================================
- Coverage     90.86%   87.65%   -3.22%     
- Complexity       90       93       +3     
============================================
  Files             6        6              
  Lines           230      243      +13     
  Branches         24       29       +5     
============================================
+ Hits            209      213       +4     
- Misses           18       24       +6     
- Partials          3        6       +3     

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