feat(cache): implement caching for intl data

[dvlin-dev]

Description

add cache

Fixes #232

Type of change

New feature (non-breaking change which adds functionality)

Test

First call intl.get once, and then check if there is a corresponding value in the cache.

• Add Test Case: cache

[cwtuan]

First of all, thanks for spending time on this project.

Is it possible to make the cache feature optional by parameter? I would like it to be disabled by default for the following reasons:

1. The cached messages may consume more memory.
2. I would like it maintain the same behavior of the previous version.

[cwtuan]

Additionally, is it possible to use the cache mechanism offered by https://formatjs.io/docs/intl/#createintlcache?

[dvlin-dev]

I submitted the code again, according to your request, make cache optional, refer to formatjs

[dvlin-dev]

The changes to the init method parameters need to be synchronized in the README.md file, just like defined in index.d.ts. However, the README.md file is ignored in the .gitignore file.

Should I delete the README.md option in the .gitignore file, or should you synchronize the changes of the init parameter?

[dvlin-dev]

I am very happy to be able to contribute (:

[dvlin-dev]

hi bro, maybe you can have a look at of this,I will use the feature plz.

[luxsush]

Bump

[cwtuan]

could you create cache object internally by adding a enableCache as one of options?

init(options) {
  if(options.enableCache) {
    // create cache object internally
  }
}