Add the missing SQLDatabase.alter(table: any SQLExpression) method

[gwynne]

These changes are now available in 3.33.0

Each of the various query builders have overloads on SQLDatabase which accept any SQLExpression parameters, except for SQLAlterTableQueryBuilder. The missing SQLDatabase.alter(table: any SQLExpression) overload is now provided.

Additional changes:

• Fixed several minor issues in the API docs.
• The minimum required Swift version is now 5.10.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 100.00%. Comparing base (e0b35ff) to head (374ac6d).
Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff            @@
##              main      #188   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files          100       100           
  Lines         2636      2662   +26     
=========================================
+ Hits          2636      2662   +26     

Files with missing lines	Coverage Δ
...uilders/Implementations/SQLAlterTableBuilder.swift	100.00% <100.00%> (ø)
...it/Builders/Implementations/SQLInsertBuilder.swift	100.00% <ø> (ø)
...s/Prototypes/SQLCommonTableExpressionBuilder.swift	100.00% <ø> (ø)
...it/Builders/Prototypes/SQLCommonUnionBuilder.swift	100.00% <ø> (ø)
.../Builders/Prototypes/SQLPartialResultBuilder.swift	100.00% <ø> (ø)
...LKit/Expressions/Clauses/SQLColumnDefinition.swift	100.00% <ø> (ø)
...ources/SQLKit/Expressions/Syntax/SQLFunction.swift	100.00% <100.00%> (ø)
Sources/SQLKit/Rows/SQLQueryEncoder.swift	100.00% <ø> (ø)

... and 18 files with indirect coverage changes

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