Add GetMetadata function to PivSampleCode

[oskardanielsson-yubico]

Add GetMetaData function

[github-actions]

Test Results: Windows

    2 files      2 suites   16s ⏱️
4 027 tests 4 008 ✅ 19 💤 0 ❌
4 029 runs  4 010 ✅ 19 💤 0 ❌

Results for commit 47874a7.

[github-actions]

Package	Line Rate	Branch Rate	Complexity	Health
Yubico.Core	45%	35%	4557	➖
Yubico.YubiKey	51%	47%	21111	➖
Summary	50% (37302 / 74784)	45% (9075 / 20289)	25668	➖

Minimum allowed line rate is 40%

[github-actions]

Test Results: Ubuntu

    2 files      2 suites   49s ⏱️
4 019 tests 4 000 ✅ 19 💤 0 ❌
4 021 runs  4 002 ✅ 19 💤 0 ❌

Results for commit 47874a7.

[github-actions]

Test Results: MacOS

    4 files      4 suites   35s ⏱️
4 001 tests 4 001 ✅ 0 💤 0 ❌
4 003 runs  4 003 ✅ 0 💤 0 ❌

Results for commit 47874a7.