Add GitHub issue creator

[mszostok]

Description

Changes proposed in this pull request:

• Add GitHub issue creator

Code moved from: kubeshop/botkube-plugins-template#7

Testing

Here is a release made on my own repo created from this template:
https://github.com/mszostok/botkube-plugins/releases/tag/v1.1.0

export SLACK_CHANNEL_NAME={channel_name}
export SLACK_APP_TOKEN={token}
export SLACK_BOT_TOKEN={token}
export PLUGINS_URL="https://github.com/mszostok/botkube-plugins/releases/download/v1.1.0/plugins-index.yaml"
export REPOSITORY={repo} # format OWNER/REPO_NAME, e.g. kubeshop/botkube
export GITHUB_TOKEN={token}

helm install --version v0.17.0 botkube --namespace botkube --create-namespace \
--set communications.default-group.socketSlack.enabled=true \
--set communications.default-group.socketSlack.channels.default.name=${SLACK_CHANNEL_NAME} \
--set communications.default-group.socketSlack.channels.default.bindings.executors={"plugin-based"} \
--set communications.default-group.socketSlack.appToken=${SLACK_APP_TOKEN} \
--set communications.default-group.socketSlack.botToken=${SLACK_BOT_TOKEN} \
--set 'plugins.repositories.botkube-plugins.url'=${PLUGINS_URL} \
--set 'executors.plugin-based.botkube-plugins/gh.config.github.repository'=${REPOSITORY} \
--set 'executors.plugin-based.botkube-plugins/gh.config.github.token'=${GITHUB_TOKEN} \
botkube/botkube

Related issue(s)

Fix #925

[pkosiec]

I already reviewed it here: https://github.com/kubeshop/botkube-plugins-template/pull/7/files

I believe it still works fine 😄 🤞