feat: minimal teams package

[irreverentsimplicity]

This PR adds a minimal team functionality, leveraging the p/demo/users realm.

Rationale:

• on top of users, there might be cases when we need agnostic representation of teams (ZenTasktic is such a case)
• the package is kept minimalistic, leaving the task of enriching the data types to the realms importing it (but it still provides functions for adding / removing users, and setting the team creator - getters can be implemented by each realm, according to their needs)
• a teams object that is identified with a specific on-chain address allows for the team to hold funds or other assets. Disbursing these funds can be done using other packages, like disperse.

AFAIK, no breaking changes have been introduced.

[codecov]

Codecov Report

Attention: Patch coverage is 60.20067% with 119 lines in your changes missing coverage. Please review.

Project coverage is 59.91%. Comparing base (01ee5a9) to head (71ca7b8).
Report is 7 commits behind head on master.

Files with missing lines	Patch %	Lines
gno.land/pkg/gnoland/app.go	0.00%	51 Missing ⚠️
gno.land/pkg/sdk/vm/keeper.go	64.64%	34 Missing and 1 partial ⚠️
gno.land/pkg/gnoland/node_inmemory.go	0.00%	15 Missing ⚠️
gno.land/pkg/gnoclient/client_txs.go	78.12%	6 Missing and 8 partials ⚠️
gno.land/pkg/integration/testing_node.go	70.00%	3 Missing ⚠️
gno.land/pkg/gnoclient/signer.go	0.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #2654      +/-   ##
==========================================
- Coverage   60.84%   59.91%   -0.94%     
==========================================
  Files         563      560       -3     
  Lines       75190    76305    +1115     
==========================================
- Hits        45753    45715      -38     
- Misses      26068    27126    +1058     
- Partials     3369     3464      +95     

Flag	Coverage Δ
contribs/gnodev	61.40% <100.00%> (+0.75%)	⬆️
contribs/gnofaucet	15.31% <ø> (+0.85%)	⬆️
gno.land	64.15% <59.66%> (-3.02%)	⬇️
gnovm	64.22% <ø> (-1.42%)	⬇️
misc/genstd	80.54% <ø> (ø)
misc/logos	19.88% <ø> (ø)
tm2	62.07% <ø> (+0.07%)	⬆️

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[leohhhn]

Hey @irreverentsimplicity, can you see to fix this PR? Theres 356 changed files, I assume because of git. I'll take a look at it right after, please ping me.

[irreverentsimplicity]

Obsoleted by #2830, I will close this for now.