feat: rebalancing connection pooling

[fenos]

What kind of change does this PR introduce?

Feature

What is the current behavior?

Currently, storage opens 1 connection to the database for every request and tears it down once it ends

What is the new behavior?

• Dedicated connection poolers for each tenant
• The pools are torn down after 5 seconds of inactivity
• starts with small pools and allows expanding the connection with additional pools to handle spiky traffic
• rebalances the pool when container autoscale
• Optional JWT caching

Additional context

Add any other context or screenshots.

[coveralls]

Pull Request Test Coverage Report for Build 14756882622

Warning: This coverage report may be inaccurate.

This pull request's base commit is no longer the HEAD commit of its target branch. This means it includes changes from outside the original pull request, including, potentially, unrelated coverage changes.

• For more information on this, see Tracking coverage changes with pull request builds.
• To avoid this issue with future PRs, see these Recommended CI Configurations.
• For a quick fix, rebase this PR at GitHub. Your next report should be accurate.

Details

• 298 of 497 (59.96%) changed or added relevant lines in 16 files are covered.
• 1 unchanged line in 1 file lost coverage.
• Overall coverage decreased (-0.4%) to 77.871%

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Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
src/config.ts	4	5	80.0%
src/internal/database/client.ts	9	10	90.0%
src/internal/database/connection.ts	14	17	82.35%
src/internal/concurrency/wait.ts	0	5	0.0%
src/internal/database/tenant.ts	31	50	62.0%
src/internal/cluster/ecs.ts	13	36	36.11%
src/internal/auth/jwt.ts	18	50	36.0%
src/internal/cluster/cluster.ts	15	53	28.3%
src/internal/database/pool.ts	167	244	68.44%

Files with Coverage Reduction	New Missed Lines	%
src/internal/database/client.ts	1	72.53%

Totals
Change from base Build 14753950118:	-0.4%
Covered Lines:	16879
Relevant Lines:	21505

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💛 - Coveralls