feat(gno.land): add read-only metadata support to packages

[jeronimoalbi]

Changes in this PR aim to explore adding support for metadata to packages.

Multiple user defined fields can be assigned as metadata.

An important part of metadata is also to allow keeping track of any tools within the gno.land ecosystem, including off chain tools, so they can optionally be associated to packages and realms. This can be done though the "tools" metadata field. This field accepts a JSON string with the following format:

{
  "tools": [
    {
      "name": "Tool Name",               // Mandatory
      "weight": 1,                       // Mandatory, 1 == 100%
      "description": "Tool description", // Optional
    },
    // ...
  ],
}

For example:

{
  "tools": [
    {
      "name": "GnoStudio",
      "weight": 0.8,
    },
    {
      "name": "Adena",
      "weight": 0.2,
      "description": "All-in-one wallet",
    },
  ],
}

Metadata can be optionally added to addpkg messages and once metadata fields are setted they can't be modified.

Metadata can also be setted using the gnokey maketx addpkg command using the -meta flag.

[Gno2D2]

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[jeronimoalbi]

Alternatively a realm could be considered to save the metadata fields

[codecov]

Codecov Report

Attention: Patch coverage is 8.88889% with 123 lines in your changes missing coverage. Please review.

Files with missing lines	Patch %	Lines
gno.land/pkg/sdk/vm/keeper.go	0.00%	54 Missing and 1 partial ⚠️
gnovm/pkg/gnolang/store.go	0.00%	20 Missing ⚠️
gno.land/pkg/keyscli/addpkg.go	39.28%	16 Missing and 1 partial ⚠️
gno.land/pkg/sdk/vm/handler.go	0.00%	14 Missing ⚠️
gno.land/pkg/sdk/vm/msgs.go	6.66%	12 Missing and 2 partials ⚠️
gno.land/pkg/sdk/vm/errors.go	0.00%	3 Missing ⚠️

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