feat: bulk reviews and separate reviews listing

[dervoeti]

This is a change I have built a while ago and now found the time to actually clean it up and open a PR. It introduces the ability to do bulk approvals and also features a separate "Reviews" page.

Why I think this is helpful:

• When someone does a huge bulk assessment, doing a bulk review of these assessments makes sense. There is usually no need to review all of these assessments one by one.
• A separate "Reviews" page allows users to bulk approve assessments across products. At least at our company, it is a pretty common case that a vulnerability affects multiple products in the same way. Hence it's very helpful to be able to do a cross-product bulk assessment and approval. Also, it's a good place for people to discover assessments that need to be reviewed.

Further changes:

• I added the possibility to filter assessments by component. We sometimes have the case that an assessment is basically the same across multiple products, but different for two components. For example, when two similar components that are both included in multiple products have observations for the same vulnerability, but only one of these components really contains the vulnerable code, while the other is a false positive. Then you want to create (and review) the assessment across all products, but separately per component.
• I removed the "Assessment status" column in the review table because it seems like it would always display the same value.

This is not a really small change and it's been a while since I did it, it might needs some further adjustments, I just wanted to kick off the contribution process. I'll be offline for some days now but am happy to chat about this when I'm back (~9th of December). But feel absolutely free to change anything in this PR yourself and even merge it in the end if you like it.

[StefanFl]

@dervoeti Please check my adjustments of your PR, before we merge it.