Add batch support and keyword case support for sql

[snuyanzin]

The PR adds support for batch insert, e.g.

Faker faker = new Faker();
Schema<String, String> schema =
    Schema.of(field("firstName", () -> faker.name().firstName()),
        field("lastName", () -> faker.name().lastName()));
SqlTransformer<String> transformer =
    new SqlTransformer.SqlTransformerBuilder<String>()
        .batch(true).dialect(SqlDialect.POSTGRES).build();
final int limit = 5;
String output = transformer.generate(schema, limit);
System.out.println(output);

will result in something like

INSERT INTO "MyTable" ("firstName", "lastName")
VALUES ('Lyman', 'Kessler'),
       ('Loriann', 'Lowe'),
       ('Gaynell', 'Blick'),
       ('Kallie', 'Kohler'),
       ('Rosalee', 'Armstrong');

Also keyword case support e.g.

Faker faker = new Faker();
Schema<String, String> schema =
    Schema.of(field("firstName", () -> faker.name().firstName()),
        field("lastName", () -> faker.name().lastName()));
SqlTransformer<String> transformer =
    new SqlTransformer.SqlTransformerBuilder<String>()
        .keywordUpperCase(false)
        .dialect(SqlDialect.POSTGRES).build();
System.out.println(transformer.generate(schema, 1));

will print sql with keywords in lowercase

insert into "MyTable" ("firstName", "lastName") values ('Mohammad', 'White');

[codecov-commenter]

Codecov Report

Merging #475 (531d3fb) into main (f5304e0) will increase coverage by 0.10%.
The diff coverage is 77.41%.

@@             Coverage Diff              @@
##               main     #475      +/-   ##
============================================
+ Coverage     93.08%   93.19%   +0.10%     
- Complexity     2111     2123      +12     
============================================
  Files           233      233              
  Lines          4398     4421      +23     
  Branches        452      458       +6     
============================================
+ Hits           4094     4120      +26     
+ Misses          190      188       -2     
+ Partials        114      113       -1     

Impacted Files	Coverage Δ
...net/datafaker/transformations/JsonTransformer.java	84.37% <25.00%> (-3.67%)	⬇️
...java/net/datafaker/transformations/SqlDialect.java	94.44% <75.00%> (-5.56%)	⬇️
.../net/datafaker/transformations/SqlTransformer.java	82.72% <85.71%> (+10.56%)	⬆️
...ain/java/net/datafaker/transformations/Casing.java	100.00% <100.00%> (ø)
.../net/datafaker/transformations/CsvTransformer.java	93.10% <100.00%> (ø)
.../main/java/net/datafaker/service/FakerContext.java	87.17% <0.00%> (+2.56%)	⬆️

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