Helper functions for match

[sshilko]

Prevent boilerplace code for constructing comples (A AND (B OR C)) queries and enforce parenthesis by

• wrapping multiple matches into another match (enforces "( many matches )") via matchAndMatch()
• helper for field IN selector to build match code for "@field A | B | C", to get rid of boilerplace everytime (cant do orMatch, must first ->match)

Feel free to rename the functions, i find them usefull in my project to prevent boilerplace

 $matches = [];
 $matches[] = $sphql->matchFieldIN('field_a', [1,2,3]);
 $matches[] = $sphql->matchFieldIN('field_b', [4,5,6]);
 $sphql->resetMatch()->match($sphql->matchAndMatch($matches));
//generates ("(@field_a 1 | 2 | 3) (@field_b 4 | 5 | 6)") without boilerplate

// (A1 AND (B2 OR C3)) still needs boilerplace like this
                    $mymatch  = (new Match($sphql))->match($mymatch1)
                                                   ->orMatch()
                                                   ->match((new Match($sphql))->match($mymatch2)->orMatch($mymatch3));

[scrutinizer-notifier]

The inspection completed: 5 new issues, 2 updated code elements

[oohnoitz]

@sshilko this looks fine, but we might want some unit tests written to make sure that the compiled query is correct and also some documentation added to README.md. Can you make those changes?