support if-match/if-none-match with s3 uploads

[harshavardhana]

Description

support if-match/if-none-match with s3 uploads

Motivation and Context

This PR supports optimistic concurrency via
if-match, if-none-match HTTP headers with s3
uploads.

A client that is performing an upload can send
the original ETag together with a conditional header
to ensure that an update will only occur if a certain
the condition has been met. For example, if the If-Match
the header is specified, MinIO verifies that the value
of the ETag specified in the update request is the
same as the ETag for the object being uploaded.

How to test this PR?

This is an extension, requires custom code
to test this.

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

[poornas]

Needs additional check at handler - sent a commit to your branch

[minio-trusted]

Mint Automation

Test	Result
mint-large-bucket.sh	✔️
mint-fs.sh	✔️
mint-erasure.sh	✔️
mint-dist-erasure.sh	✔️
mint-compress-encrypt-dist-erasure.sh	✔️
mint-pools.sh	✔️
Deleting image on docker hub
Deleting image locally