feat(native): Add http2 support for HTTP client

[kewang1024]

== RELEASE NOTES ==

General Changes
* Add http2 support for HTTP client

[sourcery-ai]

Reviewer's Guide

This PR integrates HTTP/2 support into the exchange client by adding a toggleable configuration flag and updating the SSL context, request builders, and data processing to respect this flag.

Sequence diagram for HTTP/2 protocol selection during SSL context creation

sequenceDiagram
participant Utils_createSSLContext
participant SystemConfig
participant SSLContext
Utils_createSSLContext->>SystemConfig: exchangeHttp2Enabled()
alt HTTP/2 enabled
  Utils_createSSLContext->>SSLContext: setAdvertisedNextProtocols(["h2", "http/1.1"])
else HTTP/2 disabled
  Utils_createSSLContext->>SSLContext: setAdvertisedNextProtocols(["http/1.1"])
end

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Sequence diagram for HTTP version selection in RequestBuilder

sequenceDiagram
participant "RequestBuilder()"
participant "SystemConfig"
alt HTTP/2 disabled
  "RequestBuilder()"->>"SystemConfig": exchangeHttp2Enabled()
  "RequestBuilder()"->>"headers_": setHTTPVersion(1, 1)
else HTTP/2 enabled
  "RequestBuilder()"->>"SystemConfig": exchangeHttp2Enabled()
  Note over "RequestBuilder()": Do not set HTTP version explicitly
end

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Class diagram for updated SystemConfig with HTTP/2 support

classDiagram
class SystemConfig {
  +bool exchangeHttp2Enabled() const
  +static constexpr std::string_view kExchangeHttp2Enabled
}
SystemConfig : ConfigBase

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Class diagram for updated RequestBuilder respecting HTTP/2 config

classDiagram
class RequestBuilder {
  +RequestBuilder()
  -headers_
}
RequestBuilder --> SystemConfig: uses

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Class diagram for updated SSLContext creation with HTTP/2 support

classDiagram
class SSLContext {
  +setAdvertisedNextProtocols(protocols)
}
class Utils {
  +createSSLContext()
}
Utils --> SSLContext: creates/sets protocols
Utils --> SystemConfig: checks exchangeHttp2Enabled

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File-Level Changes

Change	Details	Files
Introduce a new configuration flag for HTTP/2 in SystemConfig	Declare kExchangeHttp2Enabled in Configs.h Implement exchangeHttp2Enabled() getter Register BOOL_PROP defaulting to false in Configs.cpp	presto-native-execution/presto_cpp/main/common/Configs.h presto-native-execution/presto_cpp/main/common/Configs.cpp
Advertise HTTP/2 protocol during SSL negotiation when enabled	Include Configs.h in Utils.cpp Branch on exchangeHttp2Enabled() to set next protocols to {"h2","http/1.1"} or fallback	presto-native-execution/presto_cpp/main/common/Utils.cpp
Conditionally set HTTP version in outgoing requests	Include Configs.h in HttpClient.h Wrap headers_.setHTTPVersion(1,1) under exchangeHttp2Enabled() check	presto-native-execution/presto_cpp/main/http/HttpClient.h
Enforce non-chunked responses when HTTP/2 is disabled	Include Configs.h in PrestoExchangeSource.cpp Wrap VELOX_CHECK against chunked transfer under config guard	presto-native-execution/presto_cpp/main/PrestoExchangeSource.cpp

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[sourcery-ai]

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

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[steveburnett]

"Introduce a new configuration flag for HTTP/2 in SystemConfig" - is this config user-controllable? If so, please include documentation.

[amitkdutta]

Some minor comments.

[steveburnett]

LGTM! (docs)

Pull branch, local doc build, looks good. Thanks!

[amitkdutta]

Since now enable it for everything (exchange or othewrise), we can rename it somply http2_enabled as nothing specific to exchange is happening. Also lets do that for all variables and PR title.

[amitkdutta]

Small renaming! Overall looking great.

[amitkdutta]

Thanks @kewang1024 for iterating over it. Looks great.