[bug-fix] generate separated SQL statements

[NarekDW]

Fix the bug with generation of separated SQL statements.

For example, such code:

BaseFaker faker = new BaseFaker(new Random(10L));
        Schema<Object, ?> schema = Schema.of(
            field("Text", () -> faker.name().firstName()),
            field("Bool", () -> faker.bool().bool())
        );

        SqlTransformer<Object> transformer = new SqlTransformer.SqlTransformerBuilder<>().build();
        String sql = transformer.generate(schema, 2);

Computes such a result:
INSERT INTO "MyTable" ("Text", "Bool") VALUES ('Willis', false)INSERT INTO "MyTable" ("Text", "Bool") VALUES ('Carlena', true);

But I'm expecting to get:
INSERT INTO "MyTable" ("Text", "Bool") VALUES ('Willis', false);
INSERT INTO "MyTable" ("Text", "Bool") VALUES ('Carlena', true);

Also, added some little improvement in API of Transformer interface

[bodiam]

Seems there's a new flaky test in the phone number generators. I'll have a look. I retriggered the build

[codecov-commenter]

Codecov Report

Merging #483 (d52ed46) into main (ed7c209) will increase coverage by 0.01%.
The diff coverage is 100.00%.

@@             Coverage Diff              @@
##               main     #483      +/-   ##
============================================
+ Coverage     93.02%   93.03%   +0.01%     
- Complexity     2140     2146       +6     
============================================
  Files           233      234       +1     
  Lines          4473     4481       +8     
  Branches        467      466       -1     
============================================
+ Hits           4161     4169       +8     
- Misses          196      197       +1     
+ Partials        116      115       -1     

Impacted Files	Coverage Δ
...net/datafaker/transformations/JsonTransformer.java	84.37% <ø> (ø)
.../net/datafaker/transformations/CsvTransformer.java	96.42% <100.00%> (+3.32%)	⬆️
.../net/datafaker/transformations/SqlTransformer.java	81.02% <100.00%> (-1.15%)	⬇️
...ava/net/datafaker/transformations/Transformer.java	100.00% <100.00%> (ø)
...ker/idnumbers/pt/br/IdNumberGeneratorPtBrUtil.java	92.59% <0.00%> (-3.71%)	⬇️
...java/net/datafaker/transformations/SqlDialect.java	92.30% <0.00%> (+4.61%)	⬆️

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[bodiam]

@NarekDW nice one, thank you!