close #152 accepts IEnumerable<KeyValuePair<,>> for QueryMap

[donnytian]

Change Proposed:

1. Change parameter from IDictionary<TKey, TValue> to IEnumerable<KeyValuePair<TKey, TValue>> for RequestInfo.AddQueryMap(...) and RequestInfo.AddQueryCollectionMap(...)
2. Update method emitters to reflect such change.
3. Reword diagnostic code and message
4. Add tests
5. Update README

[donnytian]

@canton7 CI failed due to package validation, not sure how we can fix this, can we just upgrade the baseline version or just remove it temporarily? Can you please help with that?
In the end, this is not a breaking change I think.

<PackageValidationBaselineVersion>1.5.5</PackageValidationBaselineVersion>

[canton7]

I'm afraid I wasn't expecting this and I'm going to be tied up for the next week or two on other things, and this will have to wait. Sorry!

[canton7]

Apologies for the delay. This looks great, thanks!

You can squish the package validation warnings with ./build.csx build --updateCompatSuppression, which will update the suppressions XML file.