feat(flagsmith): upgrade-provider-to-latest-flagsmith-client-version

[Zaimwa9]

This PR

This PR aims to upgrade the flagsmith provider in order to be compatible with latest versions of the flagsmith sdk (from 4.x.x to 9.x.x).

Main breaking change from those versions was the introduction of evaluationContext in the FS sdk and the use of flagsmithClient.setContext to properly identify users and assign traits (also stores the environment ApiKey).

export interface EvaluationContext {
    environment?: null | EnvironmentEvaluationContext;
    identity?:    null | {
        identifier?: null | string;
        traits?:     { [key: string]: null | TraitEvaluationContext };
    };
}

This was not compatible with the flagsmith-client-provider which was switching identity using the deprecated this.identity

Related Issues

#1351 solved a similar bug. It feels cleaner to bump the version - which does include the fix. I can include the Readme updates and close the previous one?

Notes

Follow-up Tasks

Following-up on the discussion here
Refactoring in a more abstract way should come in a different scope 👍

How to test

1. Clone repo

cd libs/providers/flagsmith-client/
npm i
npm link

2. Clone flagsmith open feature example here

npm i
npm link @openfeature/flagsmith-client-provider

3. Play around :)

BEGIN_COMMIT_OVERRIDE
feat(flagsmith): upgrade-provider-to-latest-flagsmith-client-version

Release-As: 0.2.0
END_COMMIT_OVERRIDE

[Zaimwa9]

Bringing this one to your attention @thomaspoignant :)
Should be in its final state

[thomaspoignant]

Hey @Zaimwa9 I am not sure why it was assigned to me (since I am not super knowledgeable of flagsmith).
Maybe @dabeeeenster can help us to find who can review this?

[beeme1mr]

Hey @Zaimwa9, I updated the title to a feat because it will trigger a version bump and be included in the release notes. I'll wait for @matthewelwell or @dabeeeenster from Flagsmith to give the final approval. Thanks for the PR!

[Zaimwa9]

@beeme1mr thanks for the review! I'm working at flagsmith as a disclaimer 😄. We will major the sdk soon (with no impact here) so I will delay this PR until we do if that's ok for you -and have the CI passing by then!-

[Zaimwa9]

@beeme1mr , if that's ok, we will stick to this version for now as the major is delayed. So this one is ready to be merged. Thanks again for your help, I appreciate