Get by packageid and an api to search by title

[yazeedobaid]

Description

This PR modifies the NuGet feed APIs and opens a new API to search for packages. Fixes #2575

This PR fixes the NuGet feed APIs and ported them to use V3 of the NuGet feed. It uses the title query parameter to get information about a requested package. The issue with the title query parameter is that it doesn't return exact results as intended. For example,

"Pulumi.FSharp.AzureAD" |> NuGet.getLatestPackage (NuGet.getRepoUrl())

Returns results for Azure.Storage.Blobs. Likewise, if the title was replaced by id in the NuGet query endpoint it will behave the same.
To solve this the packageid query parameter is the one that returns exact matches by packageid
So, in this PR, the getPackage and getLatestPackage APIs now use the packageid in the search.
The underlying HTTPS request would be like:

https://azuresearch-usnc.nuget.org/query?q=packageid:Pulumi.FSharp.AzureAD&take=1

To make API more flexible, a new API was added searchByTitle which uses the title query parameter in the search and returns more than one result, unlike the other two APIs which return one result only.