Csv export improve

[nikitosing]

Close #5009

Changelog

• Change all the paginated quries to query with limit 10_000

• Get rid of useless DB requests on CSV export

• Add new index for blocks table:
  plan on goerli after index:

    ```
          Result  (cost=4.13..4.14 rows=1 width=8) (actual time=0.037..0.038 rows=1 loops=1)
                  InitPlan 1 (returns $0)
                    ->  Limit  (cost=0.44..4.13 rows=1 width=8) (actual time=0.035..0.035 rows=0 loops=1)
                          ->  Index Scan Backward using blocks_date on blocks b0  (cost=0.44..169589.80 rows=45868 width=8) (actual time=0.034..0.035 rows=0 loops=1)
                                Index Cond: ((date("timestamp") = to_date('2019-01-14'::text, 'YYYY-MM-DD'::text)) AND (number IS NOT NULL))
                Planning Time: 0.195 ms
                Execution Time: 0.056 ms
    ```
  

  plan on goerli before index:

    ```
    Result  (cost=26.48..26.49 rows=1 width=8) (actual time=4767.006..4767.007 rows=1 loops=1)
      InitPlan 1 (returns $0)
        ->  Limit  (cost=0.43..26.48 rows=1 width=8) (actual time=4767.002..4767.003 rows=1 loops=1)
              ->  Index Scan Backward using blocks_number_index on blocks b0  (cost=0.43..1196276.63 rows=45923 width=8) (actual time=4767.001..4767.001 rows=1 loops=1)
                    Index Cond: (number IS NOT NULL)
                    Filter: (date("timestamp") = to_date('2023-05-14'::text, 'YYYY-MM-DD'::text))
                    Rows Removed by Filter: 170549
    Planning Time: 0.463 ms
    Execution Time: 4767.027 ms
    
    ```
  

Checklist for your Pull Request (PR)

• I added an entry to CHANGELOG.md with this PR
• If I added new functionality, I added tests covering it.
• If I fixed a bug, I added a regression test to prevent the bug from silently reappearing again.
• I checked whether I should update the docs and did so by submitting a PR to https://github.com/blockscout/docs
• If I added/changed/removed ENV var, I submitted a PR to https://github.com/blockscout/docs to update the list of env vars at https://github.com/blockscout/docs/blob/master/for-developers/information-and-settings/env-variables.md and I updated the version to master in the Version column. Changes will be reflected in this table: https://docs.blockscout.com/for-developers/information-and-settings/env-variables.
• If I add new indices into DB, I checked, that they are not redundant with PGHero or other tools

[vbaranov]

@nikitosing please rebase PR to master branch.

[vbaranov]

@nikitosing just for clarification, which query execution is improved with this index?

[nikitosing]

This index improves this request which is used here