Add Standard Http base methods to Client Proxy Base

[StuartFerguson]

Add standard methods for GET,POST,PUT,PATCH,DELETE

Here is an example for GET

private async Task<Result<String>> SendGetRequest(String uri, String accessToken, CancellationToken cancellationToken) {

        HttpRequestMessage requestMessage = new HttpRequestMessage(HttpMethod.Get, uri);
        requestMessage.Headers.Authorization = new AuthenticationHeaderValue(AuthenticationSchemes.Bearer, accessToken);

        // Make the Http Call here
        HttpResponseMessage httpResponse = await this.HttpClient.SendAsync(requestMessage, cancellationToken);

        // Process the response
        Result<String> result = await this.HandleResponseX(httpResponse, cancellationToken);

        if (result.IsFailed)
            return ResultHelpers.CreateFailure(result);

        return Result.Success<String>(result.Data);
    }

Methods that take in content such as POST could they be gerneric of type T?