Add migrate command

migrate/testdata/duplicate/001_create_t1.sql

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+create table t1(
+  id serial primary key
+);
+
+---- create above / drop below ----
+
+drop table t1;

migrate/testdata/duplicate/002_create_t2.sql

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+create table t2(
+  id serial primary key
+);
+
+---- create above / drop below ----
+
+drop table t2;

migrate/testdata/duplicate/002_duplicate.sql

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+create table duplicate(
+  id serial primary key
+);
+
+---- create above / drop below ----
+
+drop table duplicate;

migrate/testdata/gap/001_create_t1.sql

@@ -0,0 +1,7 @@
+create table t1(
+  id serial primary key
+);
+
+---- create above / drop below ----
+
+drop table t1;

migrate/testdata/gap/003_irreversible.sql

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+drop table t2;

migrate/testdata/noforward/001_create_no_forward.sql

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+-- no SQL here
+-- nor here, just all comments.
+ -- comment with space before
+ 
+---- create above / drop below ----
+
+drop table t1;

migrate/testdata/sample/001_create_t1.sql

@@ -0,0 +1,7 @@
+create table t1(
+  id serial primary key
+);
+
+---- create above / drop below ----
+
+drop table t1;

migrate/testdata/sample/002_create_t2.sql

@@ -0,0 +1,7 @@
+create table t2(
+  id serial primary key
+);
+
+---- create above / drop below ----
+
+drop table t2;

migrate/testdata/sample/003_irreversible.sql

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+drop table t2;

migrate/testdata/sample/004_data_interpolation.sql

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+create table {{.prefix}}_bar(id serial primary key);
+
+---- create above / drop below ----
+
+drop table {{.prefix}}_bar;

migrate/testdata/sample/005_template_inclusion.sql

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+{{ template "shared/v1_001.sql" . }}
+
+---- create above / drop below ----
+
+drop view {{.prefix}}v1;

migrate/testdata/sample/shared/v1_001.sql

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+create view {{.prefix}}v1 as select * from t1;

migrate/testdata/sample/should_be_ignored.sql

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+-- This file should be ignored because it does not start with a number.