Added basic model definition classes

src/DapperMatic/Models/Column.cs

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+namespace DapperMatic.Models;
+
+public class Column
+{
+    public Column(string name, Type dotnetType)
+    {
+        Name = name;
+        DotnetType = dotnetType;
+    }
+
+    public string Name { get; set; }
+    public Type DotnetType { get; set; }
+    public int? Length { get; set; }
+    public int? Precision { get; set; }
+    public int? Scale { get; set; }
+    public bool Nullable { get; set; }
+    public string? DefaultValue { get; set; }
+    public bool AutoIncrement { get; set; }
+    public bool PrimaryKey { get; set; }
+    public bool Unique { get; set; }
+    public bool Indexed { get; set; }
+    public bool ForeignKey { get; set; }
+    public string? ReferenceTable { get; set; }
+    public string? ReferenceColumn { get; set; }
+    public ReferentialAction? OnDelete { get; set; }
+    public ReferentialAction? OnUpdate { get; set; }
+    public string? Comment { get; set; }
+}

src/DapperMatic/Models/ForeignKey.cs

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+namespace DapperMatic.Models;
+
+public class ForeignKey
+{
+    public ForeignKey(string name, string column, string referenceTable, string referenceColumn)
+    {
+        Name = name;
+        Column = column;
+        ReferenceTable = referenceTable;
+        ReferenceColumn = referenceColumn;
+    }
+
+    public string Name { get; set; }
+    public string Column { get; set; }
+    public string ReferenceTable { get; set; }
+    public string ReferenceColumn { get; set; }
+    public ReferentialAction OnDelete { get; set; } = ReferentialAction.NoAction;
+    public ReferentialAction OnUpdate { get; set; } = ReferentialAction.NoAction;
+}

src/DapperMatic/Models/Index.cs

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+namespace DapperMatic.Models;
+
+public class Index
+{
+    public Index(string name, string[] columns, bool unique = false)
+    {
+        Name = name;
+        Columns = columns;
+        Unique = unique;
+    }
+
+    public string Name { get; set; }
+
+    /// <summary>
+    /// Column names (optionally, appended with ` ASC` or ` DESC`)
+    /// </summary>
+    public string[] Columns { get; set; }
+    public bool Unique { get; set; }
+}

src/DapperMatic/Models/ModelDefinition.cs

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+namespace DapperMatic.Models;
+
+public class ModelDefinition
+{
+    public Type? Type { get; set; }
+    public Table? Table { get; set; }
+}

src/DapperMatic/Models/PrimaryKey.cs

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+namespace DapperMatic.Models;
+
+public class PrimaryKey
+{
+    public PrimaryKey(string name, string[] columns)
+    {
+        Name = name;
+        Columns = columns;
+    }
+
+    public string Name { get; set; }
+    public string[] Columns { get; set; }
+}

src/DapperMatic/Models/Table.cs

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+namespace DapperMatic.Models;
+
+public class Table
+{
+    public Table(string name, string? schema)
+    {
+        Name = name;
+        Schema = schema;
+    }
+
+    public string Name { get; set; }
+    public string? Schema { get; set; }
+    public PrimaryKey? PrimaryKey { get; set; }
+    public Column[] Columns { get; set; } = [];
+    public UniqueConstraint[] UniqueConstraints { get; set; } = [];
+    public Index[] Indexes { get; set; } = [];
+    public ForeignKey[] ForeignKeys { get; set; } = [];
+}

src/DapperMatic/Models/UniqueConstraint.cs

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+namespace DapperMatic.Models;
+
+public class UniqueConstraint
+{
+    public UniqueConstraint(string name, string[] columns)
+    {
+        Name = name;
+        Columns = columns;
+    }
+
+    public string Name { get; set; }
+    public string[] Columns { get; set; }
+}