fix: add Abnormal to the Session.State enum as its part of the protocol

[marandaneto]

📢 Type of change

• Bugfix
• New feature
• Enhancement
• Refactoring

📜 Description

fix: add Abnormal to the Session.State enum as its part of the protocol

💡 Motivation and Context

this would make the current version be compatible with older generated sessions data.
but it's not currently being used by the SDK.

💚 How did you test it?

📝 Checklist

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

🔮 Next steps

[codecov-commenter]

Codecov Report

❗ No coverage uploaded for pull request base (master@fb3680e). Click here to learn what that means.
The diff coverage is 100.00%.

@@            Coverage Diff            @@
##             master     #424   +/-   ##
=========================================
  Coverage          ?   60.19%           
  Complexity        ?      809           
=========================================
  Files             ?       92           
  Lines             ?     3748           
  Branches          ?      360           
=========================================
  Hits              ?     2256           
  Misses            ?     1338           
  Partials          ?      154           

Impacted Files	Coverage Δ	Complexity Δ
...try-core/src/main/java/io/sentry/core/Session.java	98.64% <100.00%> (ø)	27.00 <0.00> (?)
...o/sentry/core/SendFireAndForgetEnvelopeSender.java	78.26% <0.00%> (ø)	3.00% <0.00%> (?%)
.../java/io/sentry/core/protocol/OperatingSystem.java	0.00% <0.00%> (ø)	0.00% <0.00%> (?%)
...ry/core/exception/ExceptionMechanismException.java	100.00% <0.00%> (ø)	4.00% <0.00%> (?%)
...c/main/java/io/sentry/core/DirectoryProcessor.java	68.62% <0.00%> (ø)	7.00% <0.00%> (?%)
...src/main/java/io/sentry/core/protocol/Message.java	33.33% <0.00%> (ø)	3.00% <0.00%> (?%)
...c/main/java/io/sentry/core/cache/SessionCache.java	53.63% <0.00%> (ø)	23.00% <0.00%> (?%)
...c/main/java/io/sentry/core/SentryEnvelopeItem.java	80.48% <0.00%> (ø)	10.00% <0.00%> (?%)
...java/io/sentry/core/transport/AsyncConnection.java	70.91% <0.00%> (ø)	19.00% <0.00%> (?%)
...main/java/io/sentry/core/util/CollectionUtils.java	14.28% <0.00%> (ø)	1.00% <0.00%> (?%)
... and 83 more

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