feat: mempool header

[BLuEScioN]

Adds the mempool header

Resolves mempool header portion of this PR - #1430

Figma - https://www.figma.com/file/31q1g27k69z1yXb6r6vrRD/Stacks-Explorer-Working-File?node-id=6092%3A14261&mode=dev

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Name	Status	Preview	Comments	Updated (UTC)
hiro-explorer	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Feb 21, 2024 5:01pm

[codecov]

Codecov Report

Attention: 134 lines in your changes are missing coverage. Please review.

Comparison is base (4f2cc22) 20.62% compared to head (f1a00bf) 21.45%.
Report is 21 commits behind head on main.

Files	Patch %	Lines
src/app/transactions/MempoolFeeStats.tsx	0.00%	49 Missing and 1 partial ⚠️
src/app/transactions/MempoolFeePieChart.tsx	0.00%	34 Missing and 1 partial ⚠️
src/app/transactions/TransactionTypeFilterMenu.tsx	0.00%	23 Missing and 8 partials ⚠️
src/common/queries/useMempoolTxStats.ts	0.00%	11 Missing and 2 partials ⚠️
src/common/components/FilterMenu.tsx	33.33%	1 Missing and 1 partial ⚠️
src/app/txid/[txId]/TxDetails/Fees.tsx	0.00%	1 Missing ⚠️
...rc/common/components/modals/unlocking-schedule.tsx	0.00%	1 Missing ⚠️
src/common/queries/useMempoolFee.ts	0.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1447      +/-   ##
==========================================
+ Coverage   20.62%   21.45%   +0.83%     
==========================================
  Files         500      413      -87     
  Lines        6634     6610      -24     
  Branches     1531     1425     -106     
==========================================
+ Hits         1368     1418      +50     
+ Misses       5096     5009      -87     
- Partials      170      183      +13     

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[He1DAr]

Looks pretty solid! I left a few comments to address. Also, could you please use the same PR name and commit message convention that's already being used in the repo? Keep up the good work!

[ginny-d]

Some UI feedback:

[blockstack-devops]

🎉 This PR is included in version 1.147.0 🎉

The release is available on GitHub release

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