feat(protocol): enable strike price to token grants

[dantaik]

Minimal change to add strike price support to TimelockTokenPool. All tests are migrated from Dani's PR #15506

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Name	Status	Preview	Updated (UTC)
bridge-ui-v2-a6	✅ Ready (Inspect)	Visit Preview	Jan 18, 2024 3:05pm

[adaki2004]

@dantaik One question to the concept with an example - if i understand it well. Let's say:

1. Alice gets a grant 1, with a strike price 0.1 USD/token, e.g.: 100 tokens.
2. Alice gets a grant 2, with a strike price 1.5 USD/token, eg.: 50 token again.
3. Later, when Alice's tokens are unlocked, she is about to withdraw tokens -> but the token price e.g.: is 0.4.

In this design there is no way for Alice to refuse (or not withdraw) grant 2, and pay for just grant 1 - because all happens in the same transaction so basically all or nothing. And in this case Alice would pay 10 + 75 = 85 for 200 tokens, which worth 80 on the market. Isn't it a possible scenario ?