431: Throw error if database id was not provided

[KoditkarVedant]

Description

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Fixes #431

Type of change

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• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• This change requires a documentation update

How Has This Been Tested?

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• Test B

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Checklist:

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• I have performed a self-review of my own code
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• I have made corresponding changes to the documentation
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• I have added tests that prove my fix is effective or that my feature works
• New and existing unit tests pass locally with my changes
• Any dependent changes have been merged and published in downstream modules
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[Copilot]

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• Test/Notion.UnitTests/Notion.UnitTests.csproj: Language not supported

Comments suppressed due to low confidence (1)

Test/Notion.UnitTests/DatabasesClientTests.cs:509

• The test currently checks only for a null databaseId. Since the implementation checks for whitespace as well, consider adding test cases for empty and whitespace strings to ensure full coverage.

public async Task RetrieveAsync_throws_argument_null_exception_if_database_id_is_null_or_empty()