time: support Msgpack timestamp extension type

[nokute78]

This patch is to support MessagePack timestamp extension type. See also https://github.com/fluent/fluent-bit/issues/8641. https://github.com/msgpack/msgpack/blob/master/spec.md#timestamp-extension-type

• Use flb_time API to support Msgpack timestamp extension type for flb_log_decoder
• Add test code

Note: This patch is to support decoding only. Time will not be encoded as MessagePack timestamp extension type. Note: mpack API doesn't support MessagePack timestamp extension type. It needs another PR.

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Testing Before we can approve your change; please submit the following in a comment:

• [N/A] Example configuration file for the change
• [X] Debug log output from testing the change

• [X] Attached Valgrind output that shows no leaks or memory corruption was found

If this is a change to packaging of containers or native binaries then please confirm it works for all targets.

• [N/A] Run local packaging test showing all targets (including any new ones) build.
• [N/A] Set ok-package-test label to test for all targets (requires maintainer to do).

Documentation

• [N/A] Documentation required for this feature

Backporting

• [N/A] Backport to latest stable release.

Debug/Valgrind output

$ valgrind --leak-check=full bin/flb-it-flb_time 
==25509== Memcheck, a memory error detector
==25509== Copyright (C) 2002-2017, and GNU GPL'd, by Julian Seward et al.
==25509== Using Valgrind-3.18.1 and LibVEX; rerun with -h for copyright info
==25509== Command: bin/flb-it-flb_time
==25509== 
Test flb_time_to_nanosec...                     [ OK ]
==25509== Warning: invalid file descriptor -1 in syscall close()
Test flb_time_append_to_mpack_v1...             [ OK ]
==25509== Warning: invalid file descriptor -1 in syscall close()
Test msgpack_to_time_int...                     [ OK ]
==25509== Warning: invalid file descriptor -1 in syscall close()
Test msgpack_to_time_double...                  [ OK ]
==25509== Warning: invalid file descriptor -1 in syscall close()
Test msgpack_to_time_eventtime...               [ OK ]
==25509== Warning: invalid file descriptor -1 in syscall close()
Test msgpack_to_time_invalid...                 [2024/03/30 09:11:23] [ warn] [time] unknown ext type. type=0 size=5
[2024/03/30 09:11:23] [ warn] [time] unknown ext type. type=10 size=8
[ OK ]
==25509== Warning: invalid file descriptor -1 in syscall close()
Test msgpack_to_time_eventtime...               [ OK ]
==25509== Warning: invalid file descriptor -1 in syscall close()
Test append_to_msgpack_eventtime...             [ OK ]
==25509== Warning: invalid file descriptor -1 in syscall close()
Test append_to_msgpack_extension_time...        [ OK ]
==25509== Warning: invalid file descriptor -1 in syscall close()
SUCCESS: All unit tests have passed.
==25509== 
==25509== HEAP SUMMARY:
==25509==     in use at exit: 0 bytes in 0 blocks
==25509==   total heap usage: 7,647 allocs, 7,647 frees, 907,902 bytes allocated
==25509== 
==25509== All heap blocks were freed -- no leaks are possible
==25509== 
==25509== For lists of detected and suppressed errors, rerun with: -s
==25509== ERROR SUMMARY: 0 errors from 0 contexts (suppressed: 0 from 0)

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Fluent Bit is licensed under Apache 2.0, by submitting this pull request I understand that this code will be released under the terms of that license.