Create Golang Release go tool

[rcrozean]

Issue #, if available:

Description of changes:
These changes create a release object for eks go releases. The plan is to have a func (r Release) NewRelease, func (r Release) UpdateMinorVersion, and potentially func (r Release) Backport command.

NewRelease would be for new minor version releases.
Example PR: rcrozean#64
PR was created with this tool using command: eksGoRelease new --eksGoReleases=1.21.0 -v 4

Update would be to update supported upstream versions when patch versions are released
Example PR: rcrozean#67
PR was created with this tool using command: eksGoRelease update --eksGoReleases=1.20.5 -v 4
For the example PR an arbitrary patch version was selected.

Backport would be to attempt to patch eksGo versions not supported by upstream

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[danbudris]

I love the direction this is going in, left some thoughts.

I'd be nice to have the temp values in the dummy files be meaningful comments or pointers to documentation. This could come in a follow-on PR but wanted to capture it here.

We do need to make sure we paramaterize the git user -- wether that's through a flag, and env var, or derived from the git config. It might be easiest to use an env var for this as it would easily support both the CLI use-case as well as the Prow plugin use case

[eks-distro-bot]

@rcrozean: The following tests failed, say /retest to rerun all failed tests or /retest-required to rerun all mandatory failed tests:

Test name	Commit	Details	Required	Rerun command
golang-1-21-tooling-presubmit	4b59c57	link	true	/test golang-1-21-tooling-presubmit
eks-distro-base-tooling-presubmits-golang-1-21-al-2023	4b59c57	link	true	/test eks-distro-base-tooling-presubmits-golang-1-21-al-2023
eks-distro-base-tooling-presubmits-golang-1-21-al-2	4b59c57	link	true	/test eks-distro-base-tooling-presubmits-golang-1-21-al-2

Full PR test history. Your PR dashboard.

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[rcrozean]

/approve

[eks-distro-bot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: rcrozean

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[xdu31]

/lgtm