Add read level support for queries and unit tests · rqlite/rqlite-dotnet@f9ddcbd

The following actions uses node12 which is deprecated and will be forced to run on node16: actions/checkout@v2, actions/setup-dotnet@v1. For more info: https://github.blog/changelog/2023-06-13-github-actions-all-actions-will-run-on-node16-instead-of-node12-by-default/

The following actions use a deprecated Node.js version and will be forced to run on node20: actions/checkout@v2, actions/setup-dotnet@v1. For more info: https://github.blog/changelog/2024-03-07-github-actions-all-actions-will-run-on-node20-instead-of-node16-by-default/

Build: RqliteDotnet/UrlBuilder.cs#L15

The switch expression does not handle some values of its input type (it is not exhaustive) involving an unnamed enum value. For example, the pattern '(RqliteDotnet.ReadLevel)0' is not covered.

Build: RqliteDotnet/RqliteClient.cs#L44

Possible null reference return.

Build: RqliteDotnet/RqliteOrmClient.cs#L50