feature: hard delete by tag operation

[yss14]

As already outlined in https://github.com/Julien-R44/bentocache/issues/71, in my opinion the current naming of the deleteByTag operation is a bit misleading, since it doesn't hard delete cache entries by tag matching, but rather expires them. That's why I included a commit in this PR renaming the current deleteByTag operation to expireByTag to be compliant with the naming of the key based operations. I'm aware that this means a breaking change in the API and I'm open to discuss how to resolve this if a major release is to avoid.

The main concern of this PR is the implementation of a new operation deleteByTag, which performs a "kind of" hard delete via a lazy deletion logic via invalidation timestamps similar to the approach of the expireByTag (previously deleteByTag) operation. Here I'm also open to discuss the best approach for the hard deletion logic.

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[Julien-R44]

Thanks a lot for the PR and sorry forlate reply, i have been pretty busy these last weeks...

Just a quick ( and maybe naive) question: instead of doing a double round-trip to check hard and soft tag keys separately, what about storing some metadata inside the tag value?

Something like:

await this.stack.set('___bc:t:users', { timestamp, type: 'hard' | 'soft' })