feat(tm2): Implement Basic Authentication in HTTP Client

[linhpn99]

From #2450

This PR:

• Defines AuthInfo to carry basic authentication information when initializing http.Client
• Adds necessary unit tests

Contributors' checklist...

• Added new tests, or not needed, or not feasible
• Provided an example (e.g. screenshot) to aid review or the PR is self-explanatory
• Updated the official documentation or not needed
• No breaking changes were made, or a BREAKING CHANGE: xxx message was included in the description
• Added references to related issues and PRs
• Provided any useful hints for running manual tests
• Added new benchmarks to generated graphs, if any. More info here.

[codecov]

Codecov Report

Attention: Patch coverage is 80.00000% with 4 lines in your changes missing coverage. Please review.

Project coverage is 60.46%. Comparing base (f04ec89) to head (842a05b).
Report is 51 commits behind head on master.

Files with missing lines	Patch %	Lines
tm2/pkg/bft/rpc/lib/client/http/client.go	80.00%	2 Missing and 2 partials ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #2590      +/-   ##
==========================================
+ Coverage   60.44%   60.46%   +0.02%     
==========================================
  Files         563      563              
  Lines       75159    75171      +12     
==========================================
+ Hits        45427    45450      +23     
+ Misses      26343    26332      -11     
  Partials     3389     3389              

Flag	Coverage Δ
contribs/gnodev	61.46% <ø> (ø)
contribs/gnofaucet	14.46% <ø> (-0.86%)	⬇️
gno.land	67.21% <ø> (ø)
gnovm	64.46% <ø> (ø)
misc/genstd	80.54% <ø> (ø)
misc/logos	20.23% <ø> (+0.35%)	⬆️
tm2	62.11% <80.00%> (+0.05%)	⬆️

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[zivkovicmilos]

Blocking this until I give a detailed review -- I'm not convinced think this is the way to go

[leohhhn]

#2333 (comment)