ClangTidy warnings for `cppcoreguidelines-noexcept-move-operations`

[jviotti]

/Users/jviotti/Projects/core/src/core/json/include/sourcemeta/core/json_value.h:219:3: error: move constructors should be marked noexcept [cppcoreguidelines-noexcept-move-operations,performance-noexcept-move-constructor,-warnings-as-errors]
  219 |   JSON(JSON &&);
      |   ^
      |                 noexcept

/Users/jviotti/Projects/core/src/core/json/include/sourcemeta/core/json_value.h:221:8: error: move assignment operators should be marked noexcept [cppcoreguidelines-noexcept-move-operations,performance-noexcept-move-constructor,-warnings-as-errors]
  221 |   auto operator=(JSON &&) -> JSON &;
      |        ^
      |                            noexcept

/Users/jviotti/Projects/core/src/core/json/json_value.cc:120:7: error: move constructors should be marked noexcept [cppcoreguidelines-noexcept-move-operations,performance-noexcept-move-constructor,-warnings-as-errors]
  120 | JSON::JSON(JSON &&other) : current_type{other.current_type} {
      |       ^
      |                           noexcept

/Users/jviotti/Projects/core/src/core/json/json_value.cc:177:12: error: move assignment operators should be marked noexcept [cppcoreguidelines-noexcept-move-operations,performance-noexcept-move-constructor,-warnings-as-errors]
  177 | auto JSON::operator=(JSON &&other) -> JSON & {
      |            ^
      |                                     noexcept

/Users/jviotti/Projects/core/src/core/uri/include/sourcemeta/core/uri.h:63:3: error: move constructors should be marked noexcept [cppcoreguidelines-noexcept-move-operations,performance-noexcept-move-constructor,-warnings-as-errors]
   63 |   URI(URI &&other);
      |   ^
      |                    noexcept

/Users/jviotti/Projects/core/src/core/uri/uri.cc:137:6: error: move constructors should be marked noexcept [cppcoreguidelines-noexcept-move-operations,performance-noexcept-move-constructor,-warnings-as-errors]
  137 | URI::URI(URI &&other)
      |      ^
  138 |     : data{std::move(other.data)}, internal{std::move(other.internal)} {
      |  noexcept