cmake: Enable CMAKE_EXPORT_COMPILE_COMMANDS
cmake: Enable CMAKE_EXPORT_COMPILE_COMMANDS

With this flag enabled, cmake will generate clang compilation database
(compile_commands.json) when build files are generated.

The compilation database is used by "clangd" to provide code intel to
text editors.

Signed-off-by: Thiago Padilha <f23d94b2a735b6193d3882ae31308d2e41e8282b@calyptia.com>

fluent/fluent-bit,nokute78/fluent-bit,nokute78/fluent-bit,fluent/fluent-bit,fluent/fluent-bit,fluent/fluent-bit,fluent/fluent-bit,nokute78/fluent-bit,fluent/fluent-bit,fluent/fluent-bit,nokute78/fluent-bit,nokute78/fluent-bit,nokute78/fluent-bit,fluent/fluent-bit,nokute78/fluent-bit,fluent/fluent-bit,nokute78/fluent-bit,nokute78/fluent-bit,nokute78/fluent-bit,nokute78/fluent-bit,fluent/fluent-bit,fluent/fluent-bit,fluent/fluent-bit,nokute78/fluent-bit