This bumps the minimum version of C++ to 17 from 14 per https://github.com/grpc/proposal/blob/master/L120-requiring-cpp17.md
Changes:
- Used C++17 instead of C++14 when building gRPC.
- Disabled `modernize-unary-static-assert` clang-tidy rule for the smooth transition. This rule will be re-enabled in a future update, along with a fix to address any identified issues.
- Added a post-install script for XCode/Cocoapod examples to enforce the use of C++17 across all projects, preventing build errors. (I'd like to have a better solution here but couldn't find it)
Closes#37919
PiperOrigin-RevId: 709073401
To prepare for the upcoming upgrade to C++17, the following changes were made:
Increased minimum supported operating system versions:
- iOS: 11 (previously 10)
- macOS: 10.14 (previously 10.12)
- tvOS: 13.0 (previously 12.0)
In addition to this, version requirements across different projects were updated to use these for consistency.
Closes#37931
PiperOrigin-RevId: 686519641
Upgrade apple platform deployment_target versions to fix the cocoapods
push of BoringSSL-GRPC about the following error:
```
ld: file not found: /Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/lib/arc/libarclite_macosx.a
clang: error: linker command failed with exit code 1 (use -v to see invocation)
```
ref: https://developer.apple.com/forums/thread/725300
This also aligns with the versions required by
[protobuf](https://github.com/protocolbuffers/protobuf/pull/10652)
```
ios.deployment_target = '10.0'
osx.deployment_target = '10.12'
tvos.deployment_target = '12.0'
watchos.deployment_target = '6.0'
```
Esun Kim