misc: Remove unused includes

[amitkdutta]

Summary:
Clean up unused includes in presto_cpp/main to improve compilation times
and reduce unnecessary header dependencies:

1. Announcer.cpp:

   • Removed folly/futures/Retrying.h - no retrying symbols used
   • Removed velox/common/memory/Memory.h - no memory pool symbols used

2. PeriodicHeartbeatManager.cpp:

   • Removed velox/common/memory/Memory.h - no memory symbols used

3. PrestoExchangeSource.cpp:

   • Replaced QueryContextManager.h with the more specific
     presto_protocol/core/presto_protocol_core.h which directly provides
     the protocol namespace symbols (DataSize, Duration, PRESTO__HEADER
     constants) that are actually used. This avoids pulling in heavy
     transitive dependencies from QueryContextManager.h like
     folly/Synchronized, folly/executors/, and velox/core/QueryCtx.h.

Summary by Sourcery

Clean up unused and overly broad header dependencies in presto_cpp main sources to reduce compile-time and transitive includes.

Enhancements:

• Remove unused header includes from Announcer and PeriodicHeartbeatManager to simplify dependencies.
• Narrow PrestoExchangeSource's dependency from QueryContextManager to the specific presto_protocol_core header that provides the required protocol types and constants.

== NO RELEASE NOTE ==

[sourcery-ai]

Reviewer's guide (collapsed on small PRs)

Reviewer's Guide

This PR removes unused header includes in several presto_cpp/main translation units and narrows one dependency from a heavy umbrella header to a specific protocol header, reducing compilation dependencies and potential build times without changing runtime behavior.

File-Level Changes

Change	Details	Files
Remove unused headers from Announcer implementation.	Dropped inclusion of folly/futures/Retrying.h since no retrying-related APIs are referenced. Removed velox/common/memory/Memory.h because no memory pool or memory manager symbols are used.	presto-native-execution/presto_cpp/main/Announcer.cpp
Remove unused memory header from PeriodicHeartbeatManager.	Deleted include of velox/common/memory/Memory.h because the implementation no longer references any symbols from that header.	presto-native-execution/presto_cpp/main/PeriodicHeartbeatManager.cpp
Narrow PrestoExchangeSource’s dependency from a broad query context header to the specific protocol core header that provides the used symbols.	Replaced inclusion of presto_cpp/main/QueryContextManager.h with presto_cpp/presto_protocol/core/presto_protocol_core.h to directly import DataSize, Duration, and PRESTO_*_HEADER constants. Kept other includes unchanged, thereby avoiding heavy transitive dependencies from QueryContextManager such as folly concurrency/executor and velox query context headers.	presto-native-execution/presto_cpp/main/PrestoExchangeSource.cpp

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Hey - I've reviewed your changes and they look great!

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