Reduce allocs + improve benchmark table

[csvance]

• Reduces allocations by using deleteat! instead of filter for remove gRPCRequest from gRPCCURL
• Format URL with IOBuffer() and string() instead of interpolation
• Format grpc-timeout with string() instead of interpolation
• Remove the need to check for / replace grpc/grpcs with http/https

[codecov-commenter]

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Codecov Report

❌ Patch coverage is 85.71429% with 2 lines in your changes missing coverage. Please review.
✅ Project coverage is 85.68%. Comparing base (eb373de) to head (e289687).
⚠️ Report is 4 commits behind head on main.

Files with missing lines	Patch %	Lines
src/Curl.jl	88.88%	1 Missing ⚠️
src/gRPC.jl	80.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #74      +/-   ##
==========================================
+ Coverage   85.65%   85.68%   +0.02%     
==========================================
  Files           7        7              
  Lines         509      510       +1     
==========================================
+ Hits          436      437       +1     
  Misses         73       73              

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