fix #2206 add http handler to display version string

[nitram509]

Description of the PR

Fixes #2206

implements a simple /version endpoint, returning the server's version.

PR Checklist

• All commits have a Developer Certificate of Origin (DCO) -- they are generated using -s flag to git commit.
• All new changes are covered by tests
• n/a [ ] If GraphQL schema is changed, make generate has been run
• n/a [ ] If GraphQL schema is changed, GraphQL client updates/additions have been made
• n/a [ ] If OpenAPI spec is changed, make generate has been run
• n/a [ ] If ent schema is changed, make generate has been run
• n/a [ ] If collectsub protobuf has been changed, make proto has been run
• n/a [ ] All CI checks are passing (tests and formatting)
• n/a [ ] All dependent PRs have already been merged

[pxp928]

LGTM! Thank You!

[nitram509]

Hi @rakshitgondwal @pxp928
thanks for approving and merging this PR.
Because I'm participating in Hacktoberfest, may I ask to add the 'hacktoberfest-accepted' label, please?