feat(layout)!: add parameters to Layout::new()

[joshka]

Adds a convenience function to create a layout with a direction and a
list of constraints which are the most common parameters that would be
generally configured using the builder pattern. The constraints can be
passed in as any iterator of constraints.

let layout = Layout::new(Direction::Horizontal, [
    Constraint::Percentage(50),
    Constraint::Percentage(50),
]);

BREAKING CHANGE:
Layout::new() now takes a direction and a list of constraints instead of
no arguments. This is a breaking change because it changes the signature
of the function. Layout::new() is also no longer const because it takes
an iterator of constraints.

Layout::new() was added in a recent release, so the amount of code broken by this is reasonably small. Tagging the owners of affected repos as a headsup:
https://github.com/search?q=ratatui+%22Layout%3A%3Anew%22&type=code

• https://github.com/sxyazi/yazi @sxyazi
• https://github.com/masterned/cygnus @masterned
• https://github.com/tokisakiyuu/pound @tokisakiyuu
• https://github.com/Shadorain/shadobeam @Shadorain
• https://github.com/Fabus1184/ramp @Fabus1184
• https://github.com/TheEmeraldBee/widgetui @TheEmeraldBee

[codecov]

Codecov Report

Merging #557 (d81cbef) into main (fbf1a45) will increase coverage by 0.09%.
Report is 5 commits behind head on main.
The diff coverage is 95.74%.

@@            Coverage Diff             @@
##             main     #557      +/-   ##
==========================================
+ Coverage   89.51%   89.61%   +0.09%     
==========================================
  Files          41       41              
  Lines       11557    11628      +71     
==========================================
+ Hits        10345    10420      +75     
+ Misses       1212     1208       -4     

Files	Coverage Δ
src/layout.rs	98.81% <95.74%> (+0.56%)	⬆️

... and 1 file with indirect coverage changes