Improves service offering resource

[fabiomatavelli]

Hi,

Here is some improvement in the cloudstack_service_offering resource so we can specify the cpu_number, cpu_speed and memory now.

I've added the acceptance test CI which can be run with different versions of Cloudstack. Although it is failing, the specific test for this change is passing:

=== RUN   TestAccCloudStackServiceOffering_basic
--- PASS: TestAccCloudStackServiceOffering_basic (0.33s)

Also, I made a change in the README to include the updated version of the cloudstack-simulator.

[rohityadavcloud]

LGTM didn't test it though; let's see how the github actions behave

[rohityadavcloud]

@fabiomatavelli thank you for the PR. I liked how you've introduce a CI github action. There is a conflict with README, could you help resolve it.

[fabiomatavelli]

changes applied @rohityadavcloud, I think you'll need to approve it again

[rohityadavcloud]

Thanks @fabiomatavelli re-running github actions

[rohityadavcloud]

@fabiomatavelli can you help review/resolve the conflict?

[fabiomatavelli]

done @rohityadavcloud

[vishesh92]

clgtm