refactor: Optimise pool page queries

[garethfuller]

Description

• Uses pool provider on pool page.
• Refactors layouts so that pool page + nested join/exit flows use the same layout and providers.
• Optimises tokens provider to avoid running queries before vebal has been injected.
• Optimises usePoolQuery to not wait for token injection, this used to be important when prices were also dependent on token injection.

Type of change

• Code refactor / cleanup

How should this be tested?

• Check network requests on pool pages.

Checklist:

• I have performed a self-review of my own code
• I have requested at least 1 review (If the PR is significant enough, use best judgement here)
• I have commented my code where relevant, particularly in hard-to-understand areas
• If package-lock.json has changes, it was intentional.
• The base of this PR is master if hotfix, develop if not

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[alter-eggo]

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