Access axios-retry configuration from the error object and fix its types

[jrmyio]

I am trying to add some logging by using the retryCondition as proposed in #134 (comment).

In the message I want to log the current retryCount and the total retries.
For example: 'Re-trying {url} (1/3 tries)'.

However, I cannot access the 'retries' config variable (which is the total amount of retries) from the AxiosError object.

There seems to be a AxiosError.config['axios-retry'] in the error object that according to its types should match IAxiosRetry.IAxiosRetryConfig. Instead the AxiosError.config['axios-retry'] seems to contain a shape of
{ retryCount: number, lastRequestTime: number}.

It would be great if the { retryCount: number, lastRequestTime: number} is either merged with the existing IAxiosRetry.IAxiosRetryConfig, or use a different variable name instead.

[rgoomes]

t would be great if the { retryCount: number, lastRequestTime: number} is either merged with the existing IAxiosRetry.IAxiosRetryConfig, or use a different variable name instead.

This. I believe retry-axios does this and export the type.