Use prefix Abstract in class in src/Schema.

[terabytesoftw]

Q	A
Is bugfix?	✔️
New feature?	❌
Breaks BC?	❌

[what-the-diff]

• Rename ColumnSchema to AbstractColumnSchema
• Rename Quoter to AbstractQuoter
• Rename Schema to AbstractSchema
• Remove unused class TableBuilder and rename TableSchemea as well

[codecov]

Codecov Report

Base: 98.02% // Head: 98.02% // No change to project coverage 👍

Coverage data is based on head (eda8522) compared to base (590202f).
Patch coverage: 100.00% of modified lines in pull request are covered.

Additional details and impacted files

@@            Coverage Diff            @@
##             master     #151   +/-   ##
=========================================
  Coverage     98.02%   98.02%           
  Complexity      196      196           
=========================================
  Files            16       16           
  Lines           607      607           
=========================================
  Hits            595      595           
  Misses           12       12           

Impacted Files	Coverage Δ
src/ColumnSchema.php	100.00% <ø> (ø)
src/ColumnSchemaBuilder.php	100.00% <ø> (ø)
src/CommandPDO.php	98.41% <ø> (ø)
src/QueryBuilder.php	100.00% <ø> (ø)
src/Quoter.php	100.00% <ø> (ø)
src/Schema.php	99.61% <ø> (ø)
src/TableSchema.php	100.00% <ø> (ø)
src/DDLQueryBuilder.php	100.00% <100.00%> (ø)

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