[C++] Check for case insensitive keywords (#8420)

* chore(idl): Check for case insensitive keywords

Most languages are not affected by this change. In PHP, some names such
as Bool cannot be used because it is a reserved keyword for to the bool
data type. The field `keywords_casing` in the configs enables checking
all characters in lowercase against every keyword. This should be safe
as flatbuffers does not allow non-ASCII characters in its grammar.

* chore: Fix formatting to follow google's coding style for enums

* chore: Extract convert case to lower when CaseInsensitive

---------

Co-authored-by: Justin Davis <jtdavis777@gmail.com>
Co-authored-by: Derek Bailey <derekbailey@google.com>

src/bfbs_gen_lua.cpp

@@ -61,6 +61,7 @@ Namer::Config LuaDefaultConfig() {
           /*object_suffix=*/"",
           /*keyword_prefix=*/"",
           /*keyword_suffix=*/"_",
+          /*keywords_casing=*/Namer::Config::KeywordsCasing::CaseSensitive,
           /*filenames=*/Case::kKeep,
           /*directories=*/Case::kKeep,
           /*output_path=*/"",

src/bfbs_gen_nim.cpp

@@ -70,6 +70,7 @@ Namer::Config NimDefaultConfig() {
           /*object_suffix=*/"T",
           /*keyword_prefix=*/"",
           /*keyword_suffix=*/"_",
+          /*keywords_casing=*/Namer::Config::KeywordsCasing::CaseSensitive,
           /*filenames=*/Case::kKeep,
           /*directories=*/Case::kKeep,
           /*output_path=*/"",

src/idl_gen_dart.cpp

@@ -48,6 +48,7 @@ static Namer::Config DartDefaultConfig() {
           /*object_suffix=*/"T",
           /*keyword_prefix=*/"$",
           /*keyword_suffix=*/"",
+          /*keywords_casing=*/Namer::Config::KeywordsCasing::CaseSensitive,
           /*filenames=*/Case::kKeep,
           /*directories=*/Case::kKeep,
           /*output_path=*/"",

src/idl_gen_go.cpp

@@ -75,6 +75,7 @@ static Namer::Config GoDefaultConfig() {
           /*object_suffix=*/"T",
           /*keyword_prefix=*/"",
           /*keyword_suffix=*/"_",
+          /*keywords_casing=*/Namer::Config::KeywordsCasing::CaseSensitive,
           /*filenames=*/Case::kKeep,
           /*directories=*/Case::kKeep,
           /*output_path=*/"",

src/idl_gen_java.cpp

@@ -46,6 +46,7 @@ static Namer::Config JavaDefaultConfig() {
       /*object_suffix=*/"T",
       /*keyword_prefix=*/"",
       /*keyword_suffix=*/"_",
+      /*keywords_casing=*/Namer::Config::KeywordsCasing::CaseSensitive,
       /*filenames=*/Case::kKeep,
       /*directories=*/Case::kKeep,
       /*output_path=*/"",

src/idl_gen_kotlin.cpp

@@ -64,6 +64,7 @@ static Namer::Config KotlinDefaultConfig() {
           /*object_suffix=*/"T",
           /*keyword_prefix=*/"",
           /*keyword_suffix=*/"_",
+          /*keywords_casing=*/Namer::Config::KeywordsCasing::CaseSensitive,
           /*filenames=*/Case::kKeep,
           /*directories=*/Case::kKeep,
           /*output_path=*/"",

src/idl_gen_kotlin_kmp.cpp

@@ -62,6 +62,7 @@ static Namer::Config KotlinDefaultConfig() {
           /*object_suffix=*/"T",
           /*keyword_prefix=*/"",
           /*keyword_suffix=*/"E",
+          /*keywords_casing=*/Namer::Config::KeywordsCasing::CaseSensitive,
           /*filenames=*/Case::kUpperCamel,
           /*directories=*/Case::kLowerCamel,
           /*output_path=*/"",

src/idl_gen_rust.cpp

@@ -49,6 +49,7 @@ static Namer::Config RustDefaultConfig() {
           /*object_suffix=*/"T",
           /*keyword_prefix=*/"",
           /*keyword_suffix=*/"_",
+          /*keywords_casing=*/Namer::Config::KeywordsCasing::CaseSensitive,
           /*filenames=*/Case::kSnake,
           /*directories=*/Case::kSnake,
           /*output_path=*/"",

src/idl_gen_swift.cpp

@@ -47,6 +47,7 @@ static Namer::Config SwiftDefaultConfig() {
           /*object_suffix=*/"T",
           /*keyword_prefix=*/"",
           /*keyword_suffix=*/"_",
+          /*keywords_casing=*/Namer::Config::KeywordsCasing::CaseSensitive,
           /*filenames=*/Case::kKeep,
           /*directories=*/Case::kKeep,
           /*output_path=*/"",

src/idl_gen_ts.cpp

@@ -67,6 +67,7 @@ Namer::Config TypeScriptDefaultConfig() {
           /*object_suffix=*/"T",
           /*keyword_prefix=*/"",
           /*keyword_suffix=*/"_",
+          /*keywords_casing=*/Namer::Config::KeywordsCasing::CaseSensitive,
           /*filenames=*/Case::kDasher,
           /*directories=*/Case::kDasher,
           /*output_path=*/"",