feat: Added decimal alignment option

[DenverCoder1]

from table2ascii import table2ascii as t2a, PresetStyle, TableStyle, Alignment

output = t2a(
    header=["1.1.1", "G", "Long Header", "H", "R"],
    body=[[100.00001, 2, 3.14, 33, "AB"], [10.0001, 22.0, 2.718, 3, "CD"]],
    footer=[10000.01, "123", 10.0, 1, "E"],
    alignments=[Alignment.DECIMAL] * 5,
    first_col_heading=True,
    style=PresetStyle.double_thin_box,
)

print(output)

╔═════════════╦═══════╤═════════════╤════╤════╗
║    1.1.1    ║   G   │ Long Header │ H  │ R  ║
╠═════════════╬═══════╪═════════════╪════╪════╣
║   100.00001 ║   2   │    3.14     │ 33 │ AB ║
╟─────────────╫───────┼─────────────┼────┼────╢
║    10.0001  ║  22.0 │    2.718    │  3 │ CD ║
╠═════════════╬═══════╪═════════════╪════╪════╣
║ 10000.01    ║ 123   │   10.0      │  1 │ E  ║
╚═════════════╩═══════╧═════════════╧════╧════╝