meson: set default buildtype to debugoptimized

In general, turning on optimization tends to find more code
issues and is closer to how Yocto builds our code.  Set
'debugoptimized' as the default buildtype.

Signed-off-by: Patrick Williams <patrick@stwcx.xyz>
Change-Id: I69cefed4eea2b9bc970cfdc373b158c016a52303
diff --git a/meson.build b/meson.build
index 24516e9..705efe5 100644
--- a/meson.build
+++ b/meson.build
@@ -1,5 +1,6 @@
 project('sdbusplus', 'cpp',
     default_options: [
+      'buildtype=debugoptimized',
       'cpp_std=c++17',
       'werror=true',
     ],