Add a JavaScript binding for nanoColor

Currently OCIO is not available for use in web applications (i.e., running in a browser). This task is to add a JavaScript binding that makes it simple to use OCIO for color management in web applications.

The proposal is that this binding would only be available for nanoColor, since it is specifically targeted as a lighter weight version of OCIO that is simpler to adapt for this purpose.

More details will be forthcoming, but if people have requirements for this feature, please add a comment to this issue.

未指定文件、测试或入口点。首先定位 nanoColor 的实现以及任何现有的语言绑定，然后与 issue 相关方明确浏览器要求；当达成共识的 JavaScript 绑定支持 Web 应用中的 nanoColor 颜色管理时，工作即告完成。

由索引模型根据 Issue 内容生成。