LoremIpsumAnonymizer - Add customization options + documentation

[SimonMellerin]

1/ Add customization options

LoremIpsumAnonymizer takes for now these options:

• 'paragraphs': (int) number of paragraphs, default is 1,
• 'html': (bool) surround each paragraph with <p>, default is false.
• 'sample_count': (int) how many different values to use (default is 100).

It could be nice to have another option words (int):

• If this option is given, the Anonymizer does not fill the anonymized value with a complete paragraph but only with words
• The value of the option gives the number of words to generate
• This option could not be used associated with paragraphs

2/ Documentation

LoremIpsumAnonymizer should be documented in docs/content/anonymization/core-anonymizers.md

[SimonMellerin]

done with #112