Add Support For Enable Keep Me Signed In Flow - Flutter Username Password autofill from next session if already added remember me option

[jaym-xa]

Hey @mohanajuhi166 @microsoftopensource @Baxi19 @Sleeknoah

I was recently wanted to add the feature option to enable keep me signed in feature using microsoft b2c login, But I don't find any support using this package. I've added changes to B2C policy as guided in the following official blog, https://github.com/azure-ad-b2c/unit-tests/tree/main/session#enable-keep-me-signed-in-kmsi

So can you please help adding support from flutter side keep me signed in feature using this package?

Thanks

[mohanajuhi166]

@jaym-xa , looking into this.