feat: Added Rhumb Line Distance algorithm to navigation module

[showmyth]

Pull Request Template

Description

Added rhumb line functions for navigation calculations using constant bearing paths.
Functions added:

rhumb_distance - Distance between two points
rhumb_bearing - Bearing from point A to B
rhumb_destination - Find point after traveling distance at bearing

Rhumb lines maintain constant compass bearing, making them easier to follow with a compass compared to great circle routes.

Type of change

Please delete options that are not relevant.

• New feature (non-breaking change which adds functionality)

Checklist:

• I ran bellow commands using the latest version of rust nightly.
• I ran cargo clippy --all -- -D warnings just before my last commit and fixed any issue that was found.
• I ran cargo fmt just before my last commit.
• I ran cargo test just before my last commit and all tests passed.
• I added my algorithm to the corresponding mod.rs file within its own folder, and in any parent folder(s).
• I added my algorithm to DIRECTORY.md with the correct link.
• I checked COUNTRIBUTING.md and my code follows its guidelines.

Please make sure that if there is a test that takes too long to run ( > 300ms), you #[ignore] that or
try to optimize your code or make the test easier to run. We have this rule because we have hundreds of
tests to run; If each one of them took 300ms, we would have to wait for a long time.

[codecov-commenter]

Codecov Report

❌ Patch coverage is 95.65217% with 3 lines in your changes missing coverage. Please review.
✅ Project coverage is 95.34%. Comparing base (379b934) to head (357c454).

Files with missing lines	Patch %	Lines
src/navigation/rhumbline.rs	95.65%	3 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #934   +/-   ##
=======================================
  Coverage   95.34%   95.34%           
=======================================
  Files         320      321    +1     
  Lines       20970    21039   +69     
=======================================
+ Hits        19994    20060   +66     
- Misses        976      979    +3     

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[showmyth]

Hey @siriak ! Could you review this PR whenever you get a chance? Much appreciated.

[siriak]

Looks good, thanks!