update the hdfs in spark component

[Gnanasundaramsampath-sys]

Description
This PR addresses Work Item 3842468:
https://msdata.visualstudio.com/Vienna/_workitems/edit/3842468/?view=edit

What changed
Added HDFS input mode support for Azure ML job and pipeline input serialization/deserialization.
Added hdfs mode constant in input/output mode definitions.
Added REST mapping support for both Hdfs and hdfs input values.
Improved mode handling robustness in pipeline IO conversion to support both enum and string mode values.
Added unit test coverage for HDFS input mode round-trip behaviour in pipeline job schema tests.

Validation
Verified wheel build succeeds.
Verified sdist build succeeds.
Verified packaging output is clean for the updated behaviour.

Additional maintenance change
Updated package discovery exclusions in pyproject.toml to exclude build artifacts:
build*
dist*
.egg-info
This avoids accidental inclusion of transient build outputs during wheel/sdist packaging.

All SDK Contribution checklist:

The pull request does not introduce breaking changes.
Tests were updated for the changed behaviour.
Changes are scoped to Work Item 3842468.

• I have read the contribution guidelines.

General Guidelines and Best Practices

• Title of the pull request is clear and informative.
• There are a small number of commits, each of which have an informative message. This means that previously merged commits do not appear in the history of the PR. For more information on cleaning up the commits in your PR, see this page.

Testing Guidelines

• Pull request includes test coverage for the included changes.

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