Request logger

[lmangani]

Adds two ENV variables for testing with debug and syslog output:

• DUCKDB_HTTPSERVER_DEBUG
• DUCKDB_HTTPSERVER_SYSLOG

Potential solution driver for #16

# DUCKDB_HTTPSERVER_DEBUG=1 DUCKDB_HTTPSERVER_FOREGROUND=1 ./build/release/duckdb
v1.1.3 19864453f7
Enter ".help" for usage hints.
Connected to a transient in-memory database.
Use ".open FILENAME" to reopen on a persistent database.
D SELECT httpserve_start('0.0.0.0', 8123, '');
[2024-12-03 17:03:16] POST / - 200 - from xxxxxx:63795
[2024-12-03 17:03:21] POST / - 200 - from xxxxxx:63796

syslog

# DUCKDB_HTTPSERVER_SYSLOG=1 DUCKDB_HTTPSERVER_FOREGROUND=1 ./build/release/duckdb
# tail /var/log/syslog

2024-12-03T17:48:28.886512+00:00 localhost duckdb-httpserver[380711]: POST / - 200 - from xxxxxx:64215
2024-12-03T17:48:29.083374+00:00 localhost duckdb-httpserver[380711]: POST / - 200 - from xxxxxx:64215
2024-12-03T17:48:32.788998+00:00 localhost duckdb-httpserver[380711]: POST / - 200 - from xxxxxx:64215
2024-12-03T17:48:33.277387+00:00 localhost duckdb-httpserver[380711]: POST / - 200 - from xxxxxx:64219
2024-12-03T17:48:33.427904+00:00 localhost duckdb-httpserver[380711]: POST / - 200 - from xxxxxx:64219
2024-12-03T17:48:33.616345+00:00 localhost duckdb-httpserver[380711]: POST / - 200 - from xxxxxx:64219
2024-12-03T17:48:33.800700+00:00 localhost duckdb-httpserver[380711]: POST / - 200 - from xxxxxx:64219
2024-12-03T17:48:34.000172+00:00 localhost duckdb-httpserver[380711]: POST / - 200 - from xxxxxx:64219