add dynamic header size config for http server and client

[Chaho12]

Add dynamic header size config for http server and client

• Idk where to document it. Any ideas?
• https://trinodb.slack.com/archives/C059KUNPTSP/p1695708028907499

Values set in the conf are the default sizes set by Jetty
HttpConfiguration & HttpClient

  // Set size for HttpConfiguration
  private int outputBufferSize = 32 * 1024;
  private int requestHeaderSize = 8 * 1024;
  private int responseHeaderSize = 8 * 1024;

  // Set size for HttpClient
  private int requestBufferSize = 4 * 1024;
  private int responseBufferSize = 16 * 1024;

[willmostly]

Looks about ready, a couple minor comments

[willmostly]

One more small change.

[willmostly]

Please squash commits. Approved % investigation into why the test can't use a header > 8kb even though the real server can.

[Chaho12]

Squashed and rebased :)

[mosabua]

Looks good. I changed the commit message and merged.