feat: update rviz splash and vehicle UI display

[KhalilSelyan]

Description

Part of:

• Modernize the RViz2 overlay interface autoware#3984

Updated the autoware splash screen, and the display plugin for the vehicle ui

Tests performed

Not applicable.

Effects on system behavior

Not applicable.

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[xmfcx]

Thanks! I will test it today

[xmfcx]

I've renamed it back to autoware.png from autoware_splash.png with cb4049e

Before:

After:

There are some slight variations from the original design but we can address them later in the Universe:

• gear should be a bit more rounded
• speed limit and traffic light should have same radius
• speed limit text should be larger
• inside of the speed limit logo is fully transparent, should be opaque
• left-right signals should be more faded (when not active), right now they are white

I should have made these comments in the initial Universe review but I wanted to have it all merged first.

Thanks for all the work, I think we can merge it now, it looks great!

[xmfcx]

@kosuke55 @yukkysaito @mitsudome-r you can review in next few days if you like to, I would like to merge this on Thursday if possible.

[TakaHoribe]

so cool!

[xmfcx]

About the splash screen image, for reference:

We followed the brand guidelines of the Autoware logo.

Also used the https://coolors.co/3f2ee3-00c8ff-00e678-ff5c0f-00002a-0094ff oxford blue from the Autoware website's new color palette for the background.

Adding a transparent bg version here in case it might be useful in the future.

(this image won't be visible on light backgrounds)