feat(awssecrets): add support for binary

[JBOClara]

Description

We use SecretBinary has key part to retreive binary data from AWS Secrets Manager.

Fixes: #499

Checklist

Please make sure that your PR fulfills the following requirements:

• Reviewed the guidelines for contributing to this repository
• The commit message follows the Conventional Commits Guidelines.
• Tests for the changes have been updated
• Are you adding dependencies? If so, please run go mod tidy -compat=1.17 to ensure only the minimum is pulled in.
• Docs have been added / updated
• Optional. My organization is added to USERS.md.

Type of Change

• Bugfix
• Feature
• Code style update (formatting, local variables)
• Refactoring (no functional changes, no api changes)
• New tests
• Build/CI related changes
• Documentation content changes
• Other (please describe)

Other information

[codecov-commenter]

Codecov Report

Merging #500 (6ce7756) into main (359a636) will increase coverage by 0.07%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             main     #500      +/-   ##
==========================================
+ Coverage   75.31%   75.38%   +0.07%     
==========================================
  Files          25       25              
  Lines        1689     1694       +5     
==========================================
+ Hits         1272     1277       +5     
  Misses        323      323              
  Partials       94       94              

Impacted Files	Coverage Δ
pkg/backends/awssecretsmanager.go	69.56% <100.00%> (+3.71%)	⬆️

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[werne2j]

Thanks @JBOClara!