Add the default serverName to SentryOptions and use it in MainEventProcessor

[metlos]

📢 Type of change

• Bugfix
• New feature
• Enhancement
• Refactoring

📜 Description

This adds support for the default server name specified in sentry options so that it can be used in events.

💡 Motivation and Context

This feature exists in sentry-java and is a documented Sentry option, e.g. https://docs.sentry.io/error-reporting/configuration/?platform=csharp#server-name

💚 How did you test it?

Updated the unit tests of the MainEventProcessor to test that the option is applied.

📝 Checklist

• I reviewed submitted code
• I added tests to verify changes
• All tests passing

[codecov-io]

Codecov Report

Merging #279 into master will increase coverage by 0.18%.
The diff coverage is 100%.

@@             Coverage Diff              @@
##             master     #279      +/-   ##
============================================
+ Coverage      57.3%   57.49%   +0.18%     
- Complexity      582      587       +5     
============================================
  Files            73       73              
  Lines          2785     2790       +5     
  Branches        235      236       +1     
============================================
+ Hits           1596     1604       +8     
+ Misses         1072     1069       -3     
  Partials        117      117

Impacted Files	Coverage Δ	Complexity Δ
...c/main/java/io/sentry/core/MainEventProcessor.java	76.31% <100%> (+1.31%)	10 <0> (+1)	⬆️
...re/src/main/java/io/sentry/core/SentryOptions.java	79.67% <100%> (+0.5%)	60 <2> (+2)	⬆️
...core/src/main/java/io/sentry/core/SentryEvent.java	64.28% <0%> (+2.67%)	42% <0%> (+2%)	⬆️

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[bruno-garcia]

👍