Add endpoint for object limit

[Hitenjain14]

Changes

Fixes

Tests

Tasks to complete before merging PR:

• [ ] Ensure system tests are passing. If not Run them manually to check for any regressions :clipboard:
• [ ] Do any new system tests need added to test this change? do any existing system tests need updated? If so create a PR at 0chain/system_test
• [ ] Merge your system tests PR to master AFTER merging this PR

Associated PRs (Link as appropriate):

• 0chain:
• gosdk:
• system_test:
• zboxcli:
• zwalletcli:
• Other: ...

[codecov-commenter]

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Codecov Report

Attention: Patch coverage is 11.11111% with 8 lines in your changes missing coverage. Please review.

Project coverage is 14.89%. Comparing base (24c913a) to head (a7661a4). Report is 77 commits behind head on sprint-1.16.

Files	Patch %	Lines
code/go/0chain.net/blobbercore/handler/handler.go	11.11%	8 Missing :warning:

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Additional details and impacted files

```diff @@ Coverage Diff @@ ## sprint-1.16 #1455 +/- ## ============================================ Coverage 14.89% 14.89% ============================================ Files 179 180 +1 Lines 20183 20265 +82 ============================================ + Hits 3006 3019 +13 - Misses 16804 16874 +70 + Partials 373 372 -1 ``` | [Flag](https://app.codecov.io/gh/0chain/blobber/pull/1455/flags?src=pr&el=flags&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=0chain) | Coverage Δ | | |---|---|---| | [Unit-Tests](https://app.codecov.io/gh/0chain/blobber/pull/1455/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=0chain) | `14.89% <11.11%> (+<0.01%)` | :arrow_up: | Flags with carried forward coverage won't be shown. [Click here](https://docs.codecov.io/docs/carryforward-flags?utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=0chain#carryforward-flags-in-the-pull-request-comment) to find out more.

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