include http stats in the explain analyze statement

[chrisiou]

This PR includes HTTP info collected from Azure Storage in the explain analyze statement output.

changes:

• utilizes theAzure::Core::Diagnostics::Logger to capture logs and uses a global instance of http_state to maintain stats
• added an azure_http_stats setting option, which enables this feature (default value is false)
• expanded the azure.test with additional statements

notes/limitations:

• guarded global variables are used to allow sharing the stats across multiple files in parsing
• the results may be inaccurate for more than one active duckdb connection
• the extraction of received and sent bytes is not implemented. (I am not very familiar with Azure Storage, so) here are some links that may be useful for a future try:
  • after an HTTP request is sent to the storage service, Azure logger sends a response message with info related to the request status. There is a content-length field whose value, if the request was successful, is equal to the packet size. If a request is unsuccessful, this value may not be equal to that.
    source: Azure Storage Documentation - log format
  • Azure log entries
  • Wireshark - get total bytes from captured packets
  • Wireshark - Show Packet Bytes

[samansmink]

Hey @chrisiou thanks for the PR, looks great! i added 2 small comments

[samansmink]

Thanks again @chrisiou!