Add the credentials fetching code and an example program.

[schmidtw]

No description provided.

[guardrails]

⚠️ We detected 1 security issue in this pull request:

Insecure Network Communication (1)

Severity	Details	Docs
Medium	Title: Insecure SSL/TLS versions allowed xmidt-agent/internal/credentials/cmd/example/main.go Line 60 in 5fd793b RootCAs: caCertPool,	📚

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[codecov]

Codecov Report

Merging #7 (5fd793b) into main (b80460e) will decrease coverage by 1.38%.
The diff coverage is 90.52%.

@@            Coverage Diff             @@
##             main       #7      +/-   ##
==========================================
- Coverage   93.61%   92.23%   -1.38%     
==========================================
  Files           6        9       +3     
  Lines         501      902     +401     
==========================================
+ Hits          469      832     +363     
- Misses         22       51      +29     
- Partials       10       19       +9     

Flag	Coverage Δ
unittests	92.23% <90.52%> (-1.38%)	⬇️

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Files Changed	Coverage Δ
internal/credentials/options.go	85.98% <85.98%> (ø)
internal/credentials/credentials.go	90.04% <90.04%> (ø)
internal/credentials/internal_options.go	100.00% <100.00%> (ø)