feat: Accumulate Events

[whizzzkid]

Closes: #61

In this PR:

• implementing accumulating interface
• Fixed types to accommodate accumulation of events.
• Accumulated events also accumulate segments.
• A single type of event can be flushed
• All events can be flushed.
• Automatic hookup to beforeunload event to prevent event loss.

[whizzzkid]

@SgtPooki thanks for a thorough review, I fixed most of the issues:

👍🏽 = fixed.

Discussions:

• https://github.com/ipfs-shipyard/ignite-metrics/pull/65#discussion_r1085788187
• https://github.com/ipfs-shipyard/ignite-metrics/pull/65#discussion_r1085785259
• https://github.com/ipfs-shipyard/ignite-metrics/pull/65#discussion_r1082221691

Ready for a re-review.

[github-actions[bot]]

:tada: This PR is included in version 1.3.0 :tada:

The release is available on:

• npm package (@latest dist-tag)
• GitHub release

Your semantic-release bot :package::rocket: