Add Support for --up Flag in Migration Process

[Khaleelhabeeb]

feat: Add support for --up flag in migration process

• Updated migrations.py to handle the --up flag for running upward migrations.
• Modified cli.py to include a --up flag in the migrate command, allowing users to specify migration direction.
• Ensured that the default behavior of the inspira_migrate command is to run down migrations unless the --up flag is provided.
• Checked for mutual exclusivity between --up and --down flags to avoid conflicting directions.

These changes allow users to easily specify migration direction using the --up flag, " inspira_migrate --up" will run up migrations
fixes issues #72

Tests failed

[Khaleelhabeeb]

i think the failing test is because the teardown_migration_directory fixture might be deleting the migrations directory after each test, leading to the FileNotFoundError during test_run_migrations_down. possible solution:
If down migrations are not crucial for unit testing, consider moving the teardown_migration_directory fixture to a different scope (e.g., after all tests are complete) or create a separate fixture specifically for tests that don't require down migrations.

And all test are passing when running locally