* Update loginfo to return info about inactive shards

This also updates `rekor-cli` to verify inactive shards if they exist. It also updates the sharding integration test to run loginfo and store state based on TreeID if available.

Signed-off-by: Priya Wadhwa <priya@chainguard.dev>

* Fix typo

Signed-off-by: Priya Wadhwa <priya@chainguard.dev>

* specify resp code in error

Signed-off-by: Priya Wadhwa <priya@chainguard.dev>

When printing the TreeID with rekor-cli loginfo, if the output is parsed through jq
then the TreeID gets rounded down as an int because it is bigger than JSON allows Numbers to be.

This is how jq works and is mentioned in the FAQ: https://github.com/stedolan/jq/wiki/FAQ#numbers



Switching this to a string will preserve the actual Tree ID.

Signed-off-by: Priya Wadhwa <priya@chainguard.dev>

* Add helpers and refactor sharding package

- Adds a function to get a TreeID from an ID string
- Adds testing for the above
- Consolidates validation logic for UUID, TreeID, EntryID
- Removes code that attempts to use ActiveIndex() in the sharding
  package, as this is not accessible due to import cycles
- Other small cleanup and typo fixes

Signed-off-by: Lily Sturmann <lsturman@redhat.com>

* Change logRanges to work with int64

This is the type used by the trillian TreeID and saves from having to
convert in multiple places.

Signed-off-by: Lily Sturmann <lsturman@redhat.com>

* Add TreeID to LogInfo API endpoint

WARNING: breaks loginfo cmd to current prod server

Signed-off-by: Lily Sturmann <lsturman@redhat.com>

* Update API based on logRangesFlag

Signed-off-by: Lily Sturmann <lsturman@redhat.com>

* Use API's logRanges to retrieve artifacts

Signed-off-by: Lily Sturmann <lsturman@redhat.com>

* Convert STH to checkpoint format

This switches away from sending the (now deprecated) Trillian LogRootV1
format over to the checkpoint format documented at
https://github.com/google/trillian-examples/tree/master/formats/log



Fixes: #313

Signed-off-by: Bob Callaway <bob.callaway@gmail.com>

* update boilerplate header and apply go fmt

Signed-off-by: Carlos Panato <ctadeu@gmail.com>

* lints: fix golangci-lint issues

Signed-off-by: Carlos Panato <ctadeu@gmail.com>

* updated based on feedback

Signed-off-by: Carlos Panato <ctadeu@gmail.com>

Signed-off-by: Bob Callaway <bob.callaway@gmail.com>

My swagger build introduced these, they're whitespace only but could
make larger PRs harder to review.

* add endpoint for public key and return signed tree head with loginfo

Signed-off-by: Bob Callaway <bcallawa@redhat.com>