[cpp][tiny] rename generator, update samples (#9560)

* rename generator, update samples

* add doc

* update readme

samples/client/petstore/cpp-tiny/pre_compiling_bourne.py

@@ -0,0 +1,25 @@
+Import("env")
+
+## Compatibility for bourne to work on microcontrollers
+# We insert '#define _GLIBCXX_USE_C99' in files that use std::stoll or std::to_string
+def insert_c99_into(file):
+    import fileinput
+
+    path = env['PROJECT_LIBDEPS_DIR'] + "/" + env['PIOENV'] + "/bourne/src/bourne/" + file
+    value = '#define _GLIBCXX_USE_C99 1\n'
+
+    for line in fileinput.FileInput(path,inplace=1):
+        if line.startswith('#define _GLIBCXX_USE_C99'):
+            continue
+        elif line.startswith('// D'):
+            line=line.replace(line,line+value)
+        print(line, end='')
+
+def fix_parser():
+    insert_c99_into('detail/parser.cpp')
+
+def fix_json():
+    insert_c99_into('json.cpp')
+
+fix_parser()
+fix_json()