BLD: Add and use argparse for build_exe

Co-authored-by: User-DK <User-DK@users.noreply.github.com>

.gitignore

@@ -1,3 +1,8 @@
+# We can store explicitly what we need
+/subprojects/
+!/subprojects/fmt.wrap
+!/subprojects/argparse.wrap
+!/subprojects/tomlplusplus.wrap
 *.txt
 
 .cache/

meson.build

@@ -57,6 +57,7 @@ seldon_shared_dep = declare_dependency(include_directories : _incdir,
 # ------------------------------------
 
 if get_option('build_exe')
+  _deps += subproject('argparse').get_variable('argparse_dep')
   exe = executable('seldon', sources_seldon + 'src/main.cpp',
     install : true,
     dependencies : _deps,

subprojects/argparse.wrap

@@ -0,0 +1,13 @@
+[wrap-file]
+directory = argparse-3.0
+source_url = https://github.com/p-ranav/argparse/archive/refs/tags/v3.0.tar.gz
+source_filename = argparse-3.0.tar.gz
+source_hash = ba7b465759bb01069d57302855eaf4d1f7d677f21ad7b0b00b92939645c30f47
+patch_filename = argparse_3.0-1_patch.zip
+patch_url = https://wrapdb.mesonbuild.com/v2/argparse_3.0-1/get_patch
+patch_hash = f83ed766f07c830d3922676c67959f2078a055c07bd360f19e0e114d375d1037
+source_fallback_url = https://github.com/mesonbuild/wrapdb/releases/download/argparse_3.0-1/argparse-3.0.tar.gz
+wrapdb_version = 3.0-1
+
+[provide]
+argparse = argparse_dep