feat: Allow Anonymous

[janstadt]

Closes: #255

Proposed Changes

Allow anonymous requests to influx or telegraf.

Checklist

• CHANGELOG.md updated
• Rebased/mergeable
• A test has been added if appropriate
• dotnet test completes successfully
• Commit messages are in semantic format
• Sign CLA (if not already signed)

[codecov-commenter]

Codecov Report

Merging #256 (f329a52) into master (1b8eccb) will decrease coverage by 0.47%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master     #256      +/-   ##
==========================================
- Coverage   85.17%   84.69%   -0.48%     
==========================================
  Files          72       72              
  Lines        6454     6455       +1     
==========================================
- Hits         5497     5467      -30     
- Misses        957      988      +31     

Impacted Files	Coverage Δ
Client/InfluxDBClientOptions.cs	95.28% <100.00%> (-1.03%)	⬇️
Client/Internal/ApiClient.cs	55.29% <0.00%> (-34.12%)	⬇️

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update 1b8eccb...f329a52. Read the comment docs.

[bednar]

Thanks for your PR 👍

Please, satisfy default Checklist:

and following requirements:

1. Clarify in CHANGELOG.md that the default authentication schema is Anonymous
2. Add test to default authentication schema. Something like:

   [Test]
   public void AnonymousSchema() {
       
       var options = new InfluxDBClientOptions.Builder()
           .Url("http://localhost:9999")
           .Build();
       
       Assert.AreEqual(InfluxDBClientOptions.AuthenticationScheme.Anonymous, options.AuthScheme);
   }
   into

   influxdb-client-csharp/Client.Test/InfluxDbClientFactoryTest.cs

   Line 14 in 25639c8

   public class InfluxDbClientFactoryTest

3. Add test to check Authorization header. Something like:

   [Test]
   public async Task Anonymous()
   {
       MockServer
           .Given(Request.Create().UsingGet())
           .RespondWith(CreateResponse("{\"status\":\"active\"}", "application/json"));
   
       _client.Dispose();
       _client = InfluxDBClientFactory.Create(new InfluxDBClientOptions.Builder()
           .Url(MockServerUrl)
           .Build());
       
       await _client.GetAuthorizationsApi().FindAuthorizationByIdAsync("id");
   
       var request = MockServer.LogEntries.Last();
       CollectionAssert.DoesNotContain(request.RequestMessage.Headers.Keys, "Authorization");
   }
   into

   influxdb-client-csharp/Client.Test/InfluxDbClientTest.cs

   Line 20 in 25639c8

   public class InfluxDbClientTest : AbstractMockServerTest

[janstadt]

It looks like your CLA link that gets autopopulated in your issue template no longer works. I think it changed to https://www.influxdata.com/legal/cla/. I submitted my info there. Let me know if thats the correct location.

[bednar]

It looks like your CLA link that gets autopopulated in your issue template no longer works. I think it changed to https://www.influxdata.com/legal/cla/. I submitted my info there. Let me know if thats the correct location.

Yes, it is correct location.

[bednar]

Thanks again for your PR 👍

LGTM 👌