feat(server): Add a KeyStoreScanner

[aaneja]

To allow for hot reloading the tls keystore

See for more details : https://jetty.org/docs/jetty/12.1/programming-guide/server/http.html#connector-protocol-tls-keystore-auto-reload

Testing

WIP : Will test this locally and paste results
TODO : Add a new test for this in TestHttpServerProvider, similar to an existing one

[sourcery-ai]

Reviewer's guide (collapsed on small PRs)

Reviewer's Guide

The PR integrates a KeyStoreScanner into the HttpServer setup to poll and reload the TLS keystore automatically (every 1s by default) by instantiating it with the existing SSLContextFactory and registering it as a Jetty bean.

Sequence diagram for TLS keystore auto-reload process

sequenceDiagram
    participant KeyStoreScanner
    participant SSLContextFactory
    loop Every 1s
        KeyStoreScanner->>SSLContextFactory: check for keystore changes
        alt If keystore changed
            KeyStoreScanner->>SSLContextFactory: reload()
        end
    end

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Class diagram for KeyStoreScanner integration in HttpServer

classDiagram
    class HttpServer {
        +HttpServerInfo httpServerInfo
        +Server server
        +SSLContextFactory sslContextFactory
        +KeyStoreScanner keyStoreScanner
    }
    class KeyStoreScanner {
        +KeyStoreScanner(SSLContextFactory sslContextFactory)
        +scanInterval: int
        +start()
        +stop()
    }
    class SSLContextFactory {
        +reload()
    }
    HttpServer --> KeyStoreScanner : adds bean
    KeyStoreScanner --> SSLContextFactory : monitors

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File-Level Changes

Change	Details	Files
Introduce KeyStoreScanner to enable hot-reloading of TLS keystore	Instantiate KeyStoreScanner with the existing sslContextFactory Add the scanner to the server via server.addBean(keyStoreScanner) Document the default 1s scan interval and note future configurability	http-server/src/main/java/com/facebook/airlift/http/server/HttpServer.java

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[aaneja]

Closing in favor of #134