fix: implement date and time in prompts

[reubeno]

Fills out implementation and adds tests for the follow escape sequences in prompt strings:

• \d
• \D
• \t
• \T
• \@

[github-actions]

Test Results

    2 files      9 suites   1m 14s ⏱️
  564 tests   564 ✅ 0 💤 0 ❌
1 114 runs  1 114 ✅ 0 💤 0 ❌

Results for commit 1582640.

♻️ This comment has been updated with latest results.

[github-actions]

Performance Benchmark Report

Benchmark name	Baseline (μs)	Test/PR (μs)	Delta (μs)	Delta %
expand_one_string	3.51 μs	3.51 μs	0.00 μs	⚪ Unchanged
instantiate_shell	62.22 μs	62.30 μs	0.08 μs	⚪ Unchanged
instantiate_shell_with_init_scripts	28564.83 μs	28420.24 μs	-144.59 μs	⚪ Unchanged
parse_bash_completion	2867.59 μs	2824.63 μs	-42.97 μs	🟢 -1.50%
parse_sample_script	4.45 μs	4.38 μs	-0.07 μs	⚪ Unchanged
run_echo_builtin_command	92.27 μs	92.14 μs	-0.13 μs	⚪ Unchanged
run_one_builtin_command	113.40 μs	110.92 μs	-2.48 μs	⚪ Unchanged
run_one_external_command	1757.49 μs	1751.26 μs	-6.23 μs	⚪ Unchanged
run_one_external_command_directly	823.80 μs	823.36 μs	-0.45 μs	⚪ Unchanged

Benchmarks added:

• for_loop

Code Coverage Report: Only Changed Files listed

Package	Base Coverage	New Coverage	Difference
brush-core/src/jobs.rs	🔴 42.42%	🔴 37.23%	🔴 -5.19%
brush-core/src/prompt.rs	🟢 77.92%	🟢 90.38%	🟢 12.46%
brush-core/src/sys/unix/signal.rs	🟠 67.92%	🟠 71.7%	🟢 3.78%
Overall Coverage	🟢 77.12%	🟢 77.19%	🟢 0.07%

Minimum allowed coverage is 70%, this run produced 77.19%