meson: Fix local build of the settings_gen target

Currently local meson build fails with the following error:
"""
[343/700] Generating settings_manager_hpp with a custom command
FAILED: settings_man

meson: Fix local build of the settings_gen target

Currently local meson build fails with the following error:
"""
[343/700] Generating settings_manager_hpp with a custom command
FAILED: settings_manager.hpp
<...>/env/bin/python3 ../settings.py -i ../settings_example.yaml
<...>
ModuleNotFoundError: No module named 'sdbusplus'
"""
This is happening because 'settings_manager.mako.hpp' from the
'settings_gen' target refers to python modules from the external
'sdbusplus' project. Therefore in case of a local build it is
necessary to provide search path to the relevant sdbusplus subproject
folder. Fix this with the help of 'PYTHONPATH' environment variable.

Tested:
Both local meson build and Yocto build are finished successfully.

Change-Id: I8ec81edcdeb84c82a315937d3ed31be3dbaa1aa5
Signed-off-by: Konstantin Aladyshev <aladyshev22@gmail.com>

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meson: Fix local cereal build

Currently local build is failing with a message:
"""
cereal| Exception: Failed to configure the CMake subproject: Could NOT
find Boost (missing: Boost_INCLUDE_DIR seria

meson: Fix local cereal build

Currently local build is failing with a message:
"""
cereal| Exception: Failed to configure the CMake subproject: Could NOT
find Boost (missing: Boost_INCLUDE_DIR serialization)
Subproject subprojects/cereal is buildable: NO (disabling)
"""
Since cereal requires boost only for the sandbox build and this
functionality is not needed, add option to skip building performance
sandbox comparison to solve the issue.

Tested:
"meson setup build" no longer fails with the cereal error.

Change-Id: Ie22c1b08b784aba244a50fd7fed9c5ef4eef5542
Signed-off-by: Konstantin Aladyshev <aladyshev22@gmail.com>

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build: upgrade to C++23

Meson 1.1.1 and GCC-13 both support C++23 and a sufficient portion of
the standard has been implemented. Upgrade the build to leverage it.

Change-Id: Ic398c854a3da29dd9eac8

build: upgrade to C++23

Meson 1.1.1 and GCC-13 both support C++23 and a sufficient portion of
the standard has been implemented. Upgrade the build to leverage it.

Change-Id: Ic398c854a3da29dd9eac865aa8d2b44159669bfa
Signed-off-by: Patrick Williams <patrick@stwcx.xyz>

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meson: Switch autoconf build to meson

Summary:
- Add meson build flow.
- Remove the options not being configured from yocto as configure
args and add them as constants/define in settings_manager.h

meson: Switch autoconf build to meson

Summary:
- Add meson build flow.
- Remove the options not being configured from yocto as configure
args and add them as constants/define in settings_manager.hpp

Tested:
- autotools build passes.
- meson build passes with "ninja -C build".

Change-Id: Iaa7704886cdcd5481a04bae77e02df2c6a53aee9
Signed-off-by: Jagpal Singh Gill <paligill@gmail.com>

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