Add meson option for build time schema validation

Add a meson option that controls if JSON schema validation is done
during the build and default it to enabled.

This way, it can be disabled during bitbake builds since
python3-jsonschema now brings in rust which takes quite a while to
build.

Validation does still occur during CI.

Tested:
A build with an error in a JSON file fails when validation is enabled
and passes when it isn't.

Signed-off-by: Matt Spinler <spinler@us.ibm.com>
Change-Id: If0a5335dd17f768adf2e40e6a132cf5cbd7eebd0
diff --git a/meson_options.txt b/meson_options.txt
index 770451d..ad9f7ed 100644
--- a/meson_options.txt
+++ b/meson_options.txt
@@ -7,3 +7,6 @@
 option(
     'fru-device-resizefru', value : false, type: 'boolean', description: 'Allow FruDevice to resize FRU areas.',
 )
+option(
+    'validate-json', type: 'boolean', value: true, description: 'Run JSON schema validation during the build.',
+)