fix: EXPOSED-588 Foreign key error when table has dot in its name

[joc-a]

Description

Detailed description:

• What:
  Modified the way a foreign key name is constructed.
• Why:
  When creating a child table that has a dot in its name, the foreign key name created by Exposed would include that dot, which causes an error.
• How:
  The fix is to replace the dot in the table name with an underscore when constructing the foreign key name.

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Type of Change

Please mark the relevant options with an "X":

• Bug fix
• New feature
• Documentation update

Updates/remove existing public API methods:

• Is breaking change

Affected databases:

• MariaDB
• Mysql5
• Mysql8
• Oracle
• Postgres
• SqlServer
• H2
• SQLite

Checklist

• Unit tests are in place
• The build is green (including the Detekt check)
• All public methods affected by my PR has up to date API docs
• Documentation for my change is up to date

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