Merge packages in Tier IV's AutowareArchitectureProposal repository

[mitsudome-r]

Merge packages in https://github.com/tier4/AutowareArchitectureProposal.iv

[kenji-miyake]

This is the directory structure that @mitsudome-r has discussed and agreed with AWF core members in this meeting.

If it gets messy, we can consider a new structure.
However basically, we should refactor, write design documents with rationales, and move core packages to https://github.com/autowarefoundation/autoware.core.

[kenji-miyake]

Although there are DCO errors, we'll ignore them for tier4/proposal branch.
#3 (comment)

When we merge it to main branch, @mitsudome-r will sign the squashed commits.

[kenji-miyake]

The commit hash we started porting is this.
tier4/AutowareArchitectureProposal.iv@c23d3e1