docs: add ansible installation, update manual artifact download process

[xmfcx]

Description

This PR adds the manual installation steps for the ansible and adds a new playbook for downloading artifacts.

Current manual artifact download instructions are getting out of hand and it makes more sense to just use a separate playbook just for downloading these files.

Also used these steps from the autoware/setup-dev-env.sh to install ansible.

cc. @doganulus

Tests performed

Remove the ~/autoware_data folder.

Run the updated instructions to download the artifacts.

It should create and populate the folder.

Effects on system behavior

None.

Interface changes

None.

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[esteve]

@xmfcx if I'm understanding the changes correctly, the goal is to not have manual instructions anymore and only use ansible, right?

[xmfcx]

if I'm understanding the changes correctly, the goal is to not have manual instructions anymore and only use ansible, right?

@esteve At least for this task, since it only downloads and extracts a long list of files, as long as we only keep it as a single role in a playbook, it should be fine to have it this way.

It is more manual than calling the setup-dev-env.sh but it is more automatic than calling download instructions line by line.