Split split command to sub commands.

docs/commands/split-to-row.md

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+# split row
+
+splits contents over multiple rows via the separator.
+
+Syntax: `split row <separator>`
+
+### Parameters:
+* `<separator>` the character that denotes what separates rows
+
+## Examples
+
+We can build a table from a file that looks like this
+
+```shell
+> open table.txt
+4, 0, 2, 0, 7, 8
+
+```
+
+using the `split row` command.
+
+```shell
+open table.txt | split row ", "
+━━━┯━━━━━━━━━
+ # │ <value>
+───┼─────────
+ 0 │ 4
+ 1 │ 0
+ 2 │ 2
+ 3 │ 0
+ 4 │ 7
+ 5 │ 8
+━━━┷━━━━━━━━━
+```