Add extract_name_mapping logic to fix get_all method

[mollyheamazon]

*Issue #289 *

Description of changes:
I added the extract_name_mapping variable and logic that extracts HubName from HubContentArn and ImageName from ImageVersionArn. This variable is similar to custom_key_mapping, but is a parallel condition.

Tests done:

from sagemaker_core.resources import HubContent

models = HubContent.get_all(
    hub_name="SageMakerPublicHub",
    hub_content_type="Model",
    name_contains="huggingface"
)

for model in models:
    print(model.hub_content_name)

from sagemaker_core.resources import ImageVersion

images = ImageVersion.get_all(
    image_name="sagemaker-core"
)

for image in images:
    print(image.creation_time)

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[benieric]

Does this only work for these 2 cases or applies to all arns?

[mollyheamazon]

This could potentially work for other arns, but it depends on the structure of arn and what we want to extract. HubContentArn and ImageVersionArn shares the same structure where there is "hub-content/" and "image-version/" string before the hub name and image name we want to extract.