add linestring and multilinestring for mysql

[zgid123]

Motivation / Background

In mysql, there are two column data types: linestring and multilinestring. At the moment, we cannot create those two using

t.column :test_col, :linestring
t.column :test_mcol, :multilinestring

When run db:migrate, it will print to schema.rb

# Could not dump table "tests" because of following StandardError
#   Unknown type 'linestring' for column 'ls'

Test repo: https://github.com/zgid123/test-mysql-data-type

Detail

I followed this PR: https://github.com/rails/rails/pull/49842 to add those two types. I still not know how to write unit test for this case. Please help me this one.

Additional information

Here the result after the fix

ActiveRecord::Schema[7.2].define(version: 2024_02_25_192506) do
  create_table "tests", charset: "utf8mb3", force: :cascade do |t|
    t.string "name"
    t.decimal "number", precision: 10
    t.linestring "ls"
    t.multilinestring "mls"
    t.datetime "created_at", null: false
    t.datetime "updated_at", null: false
  end
end

Checklist

Before submitting the PR make sure the following are checked:

• [x] This Pull Request is related to one change. Changes that are unrelated should be opened in separate PRs.
• [x] Commit message has a detailed description of what changed and why. If this PR fixes a related issue include it in the commit message. Ex: [Fix #issue-number]
• [ ] Tests are added or updated if you fix a bug or add a feature.
• [ ] CHANGELOG files are updated for the changed libraries if there is a behavior change or additional feature. Minor bug fixes and documentation changes should not be included.