allow configuring inline shard size value

[harshavardhana]

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Description

allow configuring inline shard size value

Motivation and Context

performance of inline v/s non-inline seems to be 2x
difference - allow configuring this in some
situations when a bigger stripe for 1MiB object size
would fall under the inline category.

How to test this PR?

We need to do performance numbers to see the difference
allow this to be configurable for now.

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Optimization (provides speedup with no functional changes)
• Breaking change (fix or feature that would cause existing functionality to change)

Checklist:

• Fixes a regression (If yes, please add commit-id or PR # here)
• Unit tests added/updated
• Internal documentation updated
• Create a documentation update request here

[harshavardhana]

The feature is now hidden and will not be available via mc admin config get/set - this is only useful for exceptional cases where we want to test these things.

Since the config and its ENV is unavailable there is no point adding _MINIO on it.

[harshavardhana]

this does not need a doc @feorlen @djwfyi