feat: supports aggregateWindow in LINQ expressions

[bednar]

Closes #278

Proposed Changes

Add support to use aggregateWindow in LINQ expression:

var query = from s in InfluxDBQueryable<Sensor>.Queryable("my-bucket", "my-org", _queryApi)
    where s.Timestamp.AggregateWindow(TimeSpan.FromSeconds(20), TimeSpan.FromSeconds(40), "mean")
    where s.Value == 5
    select s;

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 #282 (f81b1b2) into master (a5a8f4d) will increase coverage by 0.05%.
The diff coverage is 92.72%.

@@            Coverage Diff             @@
##           master     #282      +/-   ##
==========================================
+ Coverage   84.82%   84.88%   +0.05%     
==========================================
  Files          73       73              
  Lines        6491     6542      +51     
==========================================
+ Hits         5506     5553      +47     
- Misses        985      989       +4     

Impacted Files	Coverage Δ
Client.Linq/InfluxDBQueryable.cs	88.60% <0.00%> (-3.50%)	⬇️
Client.Linq/Internal/QueryExpressionTreeVisitor.cs	94.02% <96.29%> (+0.24%)	⬆️
Client.Linq/Internal/QueryAggregator.cs	98.30% <100.00%> (+0.13%)	⬆️
Client.Linq/Internal/VariableAggregator.cs	96.55% <100.00%> (+0.25%)	⬆️

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[rhajek]

LGTM