Add generate_series function

[divanik]

Changelog category:

New Feature

Changelog entry:

Add generate_series as a table function. This function generates table with an arithmetic progression with natural numbers.

Documentation entry for user-facing changes

• Documentation is written (mandatory for new features)

[CLAassistant]

All committers have signed the CLA.

[clickhouse-ci]

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[qoega]

• tests
• documentation
• cla

[alexey-milovidov]

@divanik, it slowed down, according to the performance tests.

[alesapin]

Only nitpicks, otherwise LGTM

[alesapin]

Why we don't need this condition anymore?