fix(gamma): add missing teams field to Event

[solanabettercall]

Note

Low Risk
Low risk additive change: introduces an optional teams array on Event deserialization/serialization, with no behavioral logic changes.

Overview
Adds a missing teams: Option<Vec<Team>> field to the Event response model in src/gamma/types/response.rs, allowing event payloads to include full team objects (not just home_team_name/away_team_name).

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 85.54%. Comparing base (77264a4) to head (640baaf).

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #331   +/-   ##
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  Coverage   85.54%   85.54%           
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  Files          32       32           
  Lines        5167     5167           
=======================================
  Hits         4420     4420           
  Misses        747      747           

Flag	Coverage Δ
rust	85.54% <ø> (ø)

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