Correctly parse boolean keywords (e.g. used in SQLite) in \yii\db\ColumnSchema::typecast()

[rhertogh]

Q	A
Is bugfix?	✔️
New feature?	❌
Breaks BC?	❌
Fixed issues	-

SQLite uses keywords TRUE and FALSE for boolean values (https://www.sqlite.org/datatype3.html).

When creating a column with a default value of false this keyword is returned literally when getting the table definition. E.g.:
\Yii::$app->db->getSchema()->createColumnSchemaBuilder(Schema::TYPE_BOOLEAN)->defaultValue(false).

When this string is pared it always results in a true value (in PHP var_dump((bool)'false'); results in bool(true)).
This PR fixes the boolean parsing by ensuring the value is not the (case insensitive) string 'false'.

[what-the-diff]

PR Summary

• Enhanced Typecasting in 'ColumnSchema.php'
  The function that converts different types of variables into another type has been updated in the ColumnSchema.php file. Now, it can handle 'boolean' values (true/false values) even if they are not written in a particular case, for example, not just 'false', but 'FALSE', 'False', 'fAlse' and so on. This improves the flexibility and user-friendliness of our system.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 48.02%. Comparing base (78cc719) to head (8cf3f0f).

Additional details and impacted files

@@           Coverage Diff           @@
##           master   #20122   +/-   ##
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  Coverage   48.02%   48.02%           
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  Files         445      445           
  Lines       43892    43892           
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  Hits        21080    21080           
  Misses      22812    22812           

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[samdark]

Thank you!