"Refactor: Unified sendQuery pattern for PiwikApiClient

frazilerequested to merge
issue/piwik_pro-3581378:3581378-decoupling-api-calls into 1.4.x
  • Centralized HTTP client logic in sendQuery() method
  • Added unified date range handling with getDateRangeStrings()
  • Integrated EntityTypeManagerInterface for enhanced architecture
  • Updated fetch methods to use consistent pattern"

Closes #3581378

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