chore: implement Eq & PartialEq common traits

[TieWay59]

Also reorder some derive fields to be more consistent:

Debug, Default, Clone, Copy, Eq, PartialEq, Ord, PartialOrd, Hash

see: #307

[codecov]

Codecov Report

Merging #357 (a65cab8) into main (554805d) will decrease coverage by 0.09%.
Report is 1 commits behind head on main.
The diff coverage is 46.66%.

❗ Current head a65cab8 differs from pull request most recent head 0162b1f. Consider uploading reports for the commit 0162b1f to get more accurate results

@@            Coverage Diff             @@
##             main     #357      +/-   ##
==========================================
- Coverage   84.84%   84.76%   -0.09%     
==========================================
  Files          40       40              
  Lines        8627     8603      -24     
==========================================
- Hits         7320     7292      -28     
- Misses       1307     1311       +4     

Files Changed	Coverage Δ
src/backend/crossterm.rs	0.00% <0.00%> (ø)
src/backend/mod.rs	33.33% <0.00%> (ø)
src/backend/termion.rs	27.46% <0.00%> (ø)
src/backend/test.rs	43.63% <0.00%> (ø)
src/terminal.rs	55.73% <0.00%> (ø)
src/widgets/calendar.rs	81.06% <0.00%> (ø)
src/widgets/canvas/circle.rs	97.14% <0.00%> (ø)
src/widgets/canvas/line.rs	59.67% <0.00%> (ø)
src/widgets/canvas/map.rs	0.00% <0.00%> (ø)
src/widgets/canvas/mod.rs	91.61% <0.00%> (ø)
... and 20 more

[TieWay59]

The CI / check failed at:

error: package `time v0.3.24` cannot be built because it requires rustc 1.67.0 or newer, while the currently active rustc version is 1.65.0
Either upgrade to rustc 1.67.0 or newer, or use
cargo update -p time@0.3.24 --precise ver
where `ver` is the latest version of `time` supporting rustc 1.65.0
[cargo-make] ERROR - Error while executing command, exit code: 101
[cargo-make] WARN - Build Failed.
Error: Process completed with exit code 1.

But I didn't have this error at my local env because I have higher version of rust tool chain:

~/rusty/ratatui> rustup --version                                                                                                                      08/01/2023 10:56:42 AM
rustup 1.26.0 (5af9b9484 2023-04-05)
info: This is the version for the rustup toolchain manager, not the rustc compiler.
info: The currently active `rustc` version is `rustc 1.71.0 (8ede3aae2 2023-07-12)`
~/rusty/ratatui> cargo --version                                                                                                                       08/01/2023 10:58:37 AM
cargo 1.71.0 (cfd3bbd8f 2023-06-08)
~/rusty/ratatui> rustc --version                                                                                                                       08/01/2023 10:58:43 AM
rustc 1.71.0 (8ede3aae2 2023-07-12)

@joshka I suppose we should working on bump-up the rust version in other PR.

[joshka]

#361 bumps the MSRV.

[joshka]

LGTM thanks again