feat(cli): enable sitemap scrapping

[PaulPHPE]

Use scrappy sitemap spider to read through a sitemap and gather all urls
Instead of using --url you can use --sitemap and give the sitemap to analyze

[github-actions]

Branch coverage •

File	Stmts	Miss	Cover	Missing
bases/ecoindex/cli
app.py	105	53	49%	139–142, 144, 159–160, 170, 203–204, 206, 214, 223, 225–226, 228–230, 246, 248–250, 252–253, 256, 258–261, 263, 265–266, 271, 275–276, 278, 280, 283, 285–287, 289–290, 293–295, 303, 307, 339, 341, 349, 353, 357
arguments_handler.py	81	21	74%	41–46, 48–49, 55–58, 66–67, 72–77, 79
sitemap.py	11	4	63%	16–18, 21
TOTAL	685	225	67%

[PaulPHPE]

close #29