Add Roadmap epic template

[t2gran]

This is just testing the GtiHub issue integration, @BredeD is working on making a template for Rodemap issues, and we wanted to look at how GitHub integrate this with the menus.

WE ARE NOT GOING TO MERGE THIS.

[codecov]

Codecov Report

Attention: 4 lines in your changes are missing coverage. Please review.

Comparison is base (1583f4d) 66.59% compared to head (0437397) 66.59%.
Report is 127 commits behind head on dev-2.x.

❗ Current head 0437397 differs from pull request most recent head a55f827. Consider uploading reports for the commit a55f827 to get more accurate results

Additional details and impacted files

@@              Coverage Diff              @@
##             dev-2.x    #5413      +/-   ##
=============================================
- Coverage      66.59%   66.59%   -0.01%     
+ Complexity     15290    15285       -5     
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  Files           1790     1790              
  Lines          69402    69388      -14     
  Branches        7310     7308       -2     
=============================================
- Hits           46219    46207      -12     
+ Misses         20705    20703       -2     
  Partials        2478     2478              

Files	Coverage Δ
...pplanner/graph_builder/module/osm/OsmDatabase.java	77.97% <20.00%> (ø)

... and 1 file with indirect coverage changes

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[AdrianaCeric]

Hi @t2gran, @BredeD and I discussed a template for the Roadmap Issues. If you could create a PR with the following proposal that would be great:

### Describe expected behavior:
- What: <!-- Clearly state what the desired changes or new features could look like. -->
- Why: <!-- Clearly state the effect/outcome of this change. -->
- When: <!-- Provide a timeline or timeframe for when these changes should be implemented, preferably on a quarterly basis (e.g., Y24 Q3). -->

### Linked issue(s)
<!-- Add a checkbox by typing “- [] ”. Then, link to an issue by typing “#” and searching for the issue by text or issue number.  -->

### OTP PO Discussion meeting details:
- Date: <!-- Specify the date when the discussion meeting took place. -->
- Link(s): <!-- Provide a link or location where the discussion notes or details can be found. This could be a meeting link or another document. -->

### Extra Comments (Optional) 

[t2gran]

@AdrianaCeric @BredeD We can do this together tonight, but it is very not difficult. Feel free to change this PR:

I think both of you have access, but let me know if not.

[AdrianaCeric]

Thanks for making the change @t2gran. I think I do have access as I'm allowed to edit.

[t2gran]

What is the name for this?

• Roadmap ( item | epic | topic | milestone | ... ) ?

[AdrianaCeric]

A roadmap epic works as it is usually an issue with subtasks and spans a longer timeline