Adds wildcard support for fields command

[Abigael-JT]

• Added new object FilteredColumns.java to check for wildcards in the given fields
• Added wildcard tests for fields command
• used FilteredColumns.java object to check for wildcards in table commands' fields

Description

Checklists

Testing

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• I have checked that my test files and functions have meaningful names.
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Java

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• I have only tested public behavior and not private implementation details.
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• I have tested Object Equality.
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Code Quality

• I have checked that my code follows metrics set in Procedure: Class Metrics.
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[eemhu]

is this check necessary ?

[Abigael-JT]

it throws NPE otherwise

[eemhu]

can use EqualsVerifier.forClass(FilteredColumns.class).verify() instead;