add delete schemas force option

[Radiancebobo]

Motivation

Currently, pulsarctl lacks the ability to force delete a schema. If a schema's underlying ledger cannot be opened or is in a corrupted state, the standard delete command fails.

In such scenarios, users are currently forced to switch to the Java-based pulsar-admin tool (which supports pulsar-admin schemas delete xxx -f) to clean up these schemas.

This PR adds the --force flag to pulsarctl schemas delete to support forced deletion, resolving these edge cases and bringing feature parity with the Java pulsar-admin CLI.

Modifications

• Added support for the --force flag in the schemas delete command.
• Updated the API call to pass the force option, allowing the deletion of schemas even when they are in an inconsistent state (e.g., ledger unopenable).

Verifying this change

• Make sure that the change passes the CI checks.

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This change added tests and can be verified as follows:

• Verified manually that using --force allows deleting schemas that otherwise fail to delete due to ledger issues.

hcb-admin@Ub0015:/media/hcb/vdb/code/go_code/pulsarctl$ go test -v ./pkg/ctl/schemas -run TestSchemaForceDelete 
=== RUN   TestSchemaForceDelete
--- PASS: TestSchemaForceDelete (0.12s)
=== RUN   TestSchemaForceDeleteLongFlag
--- PASS: TestSchemaForceDeleteLongFlag (0.12s)
PASS
ok      github.com/streamnative/pulsarctl/pkg/ctl/schemas       0.243s
hcb-admin@Ub0015:/media/hcb/vdb/code/go_code/pulsarctl$ go test -v ./pkg/ctl/schemas -run TestSchemaForceDeleteLongFlag 
=== RUN   TestSchemaForceDeleteLongFlag
--- PASS: TestSchemaForceDeleteLongFlag (0.10s)
PASS
ok      github.com/streamnative/pulsarctl/pkg/ctl/schemas       0.109s

Documentation

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  (This aligns the CLI behavior with the existing Admin API capabilities and standard flags)

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[Radiancebobo]

@mattisonchao @nlu90 @zymap Please review the code for me, thank you.