Handle import errors of extras modules

[dev-rinchin]

🚀 Feature Request

LightAutoML should inform a user about additional extras that he needs to install to avoid the import problem. Similar to:

LightAutoML/lightautoml/report/report_deco.py

Line 1134 in f2fa410

print("Can't generate PDF report: check manual for installing pdf extras.")

LightAutoML/lightautoml/text/tokenizer.py

Line 21 in f2fa410

warnings.warn("'nltk' - package isn't installed")

Or automatically install missing extras as in following proposal.

Proposal

try:
    from weasyprint import HTML
except ImportError:
    import pip
    pip.main(['install', '--user', 'lightautoml[pdf]'])
    from weasyprint import HTML

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