zalando / skipper / 23645621239

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Extend predicate OTelBaggage to match with value (#3940)

## Context

Currently the predicate OTelBaggage only matches based on key. 

This needs to be extended to match based on value if the value is not
empty.

## Tasks

- [x] Update `baggagePredicate` struct to include optional value field
- [x] Modify `Create()` to accept 1 or 2 arguments (key only or
key+value)
- [x] Update `Match()` to check value when provided, key-only when not
- [x] Add test cases for value matching scenarios
- [x] Run tests to verify working implementation

Signed-off-by: greeshma1196 <greeshma.mathew@gmail.com>

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