add sentry to global usings

[bruno-garcia]

Now that this is complete:

• Rename types likely to clash to include ImplicitUsings by default #1491

We can enable namespace Sentry by default

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🚫	Please consider adding a changelog entry for the next release.

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Please add an entry to CHANGELOG.md to the "Unreleased" section. Make sure the entry includes this PR's number.

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## Unreleased

- add sentry to global usings ([#3043](https://github.com/getsentry/sentry-dotnet/pull/3043))

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Generated by 🚫 dangerJS against d80a52a

[bruno-garcia]

Actually the opt-out could be simpler, as Simon said here:

#1487 (comment)

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (fbf8fac) 76.39% compared to head (1b1d0c0) 76.39%.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #3043   +/-   ##
=======================================
  Coverage   76.39%   76.39%           
=======================================
  Files         351      351           
  Lines       13257    13257           
  Branches     2645     2645           
=======================================
  Hits        10128    10128           
  Misses       2450     2450           
  Partials      679      679           

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[bruno-garcia]

Added back SentryImplicitUsings for opt-out because on generated code, it causes compilation error, so the ItemGroup Using Remove=Sentry approach didn't work.

[frankbuckley]

This clashes all over the place for me - and let alone our own types, obvious core library types - e.g.:

error CS0104: 'ISession' is an ambiguous reference between 'Microsoft.AspNetCore.Http.ISession' and 'Sentry.ISession'

It is a huge assumption to think that library users want using Sentry inkected into every source file in their projects.