feat(it_IT): generate only valid IT phone

[sniperwolf]

Changed the Italian PhoneNumber provider to generate only valid Italian phone numbers (telephone and cellphone).

[codecov-commenter]

Codecov Report

Merging #2042 into master will decrease coverage by 0.20%. The diff coverage is n/a.

@@             Coverage Diff              @@
##             master    #2042      +/-   ##
============================================
- Coverage     56.56%   56.36%   -0.21%     
  Complexity     2068     2068              
============================================
  Files           306      306              
  Lines          4849     4849              
============================================
- Hits           2743     2733      -10     
- Misses         2106     2116      +10     

Impacted Files	Coverage Δ	Complexity Δ
src/Faker/Provider/de_AT/Person.php	0.00% <0.00%> (-100.00%)	1.00% <0.00%> (ø%)
src/Faker/Provider/ne_NP/Person.php	0.00% <0.00%> (-50.00%)	2.00% <0.00%> (ø%)
src/Faker/Provider/fi_FI/Address.php	33.33% <0.00%> (-33.34%)	3.00% <0.00%> (ø%)
src/Faker/Provider/es_ES/Person.php	75.00% <0.00%> (-25.00%)	3.00% <0.00%> (ø%)
src/Faker/Provider/en_AU/Address.php	75.00% <0.00%> (-25.00%)	4.00% <0.00%> (ø%)
src/Faker/Provider/en_ZA/Address.php	50.00% <0.00%> (-25.00%)	4.00% <0.00%> (ø%)
src/Faker/Provider/ja_JP/Address.php	76.19% <0.00%> (-23.81%)	8.00% <0.00%> (ø%)
src/Faker/Provider/en_UG/Person.php	60.00% <0.00%> (-20.00%)	5.00% <0.00%> (ø%)
src/Faker/Provider/es_ES/Address.php	40.00% <0.00%> (-20.00%)	5.00% <0.00%> (ø%)
src/Faker/Provider/fr_CA/Address.php	60.00% <0.00%> (-20.00%)	5.00% <0.00%> (ø%)
... and 29 more

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