…t endpoint, along with gzip compression for both event and historical event data. (#44)

* Adding support for /import

Support for importing historical events using /import endpoint with project token authentication

* quick-fix errorResponse

fixing errorResponse

* adding gzip compression for event tracking

adding gzip compression for event tracking (both /track and /import endpoints).

new constructor with parameter useGzipCompression

update to tests, demo, and readme

* fix for /import strict=1 custom response

Fix to handle API reponse from import when using strict=1

/import does not return "1" or "0" when using strict=1.

Instead it returns: {"code":200,"status":"OK","num_records_imported":N}

* fixing token demo

* Update src/main/java/com/mixpanel/mixpanelapi/MessageBuilder.java

Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com>

* Update src/main/java/com/mixpanel/mixpanelapi/MessageBuilder.java

Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com>

* Corrected spelling of 'MixpaneAPI' to 'MixpanelAPI'.

legacy spelling correction

* using random uuidv4 if insert_id not provided

using random uuidv4 if insert_id not provided

* fixing tests for insert_id uuid check

---------

Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com>

* migrate to central portal and add github workflows

* Fix GitHub Actions deprecation warnings and address PR review comments

- Update actions/cache from v3 to v4 in all workflows
- Update actions/upload-artifact from v3 to v4
- Replace deprecated actions/create-release with actions/github-script@v7
- Add proper job outputs for version passing between jobs
- Fix undefined version reference in verify job