feat: NavSatFix publisher for GNSS simulation

[Autumn60]

• add geographic coordinate calculation scripts (GeoCoordinate.cs, GeoCoordinateConverter.cs)
• add parameter that can be set from the Inspector window for geographic calculation to Environment.cs
• add GnssRos2NavSatFixPublisher.cs to publish sensor_msgs/NavSatFix topic
  To minimize impact on other projects, it's implemented separately from the existing GnssRos2Publisher.

The motivation is to test eagleye at runtime with AWSIM.

ref link:
Geographpic coordinate calculations are implemented with reference to the following sites
=> https://vldb.gsi.go.jp/sokuchi/surveycalc/main.html

[mackierx111]

good implementation! Please check out the comments.

[Autumn60]

@mackierx111
Thank you for your accurate point.
I've corrected the relevant section.

[mackierx111]

LGTM👍