feat(`launch`): improve capability for chain metadata

[lumtis]

• add metadata-file flag to specify a file for chain metadata content in create chain command
• increase metadata max length to 1000
• add in populate.sh script a chain with metadata for launchpad overview

[codecov[bot]]

Codecov Report

Merging #979 (b8e0b2d) into develop (3e6e036) will increase coverage by 0.00%. The diff coverage is n/a.

Additional details and impacted files

[](https://codecov.io/gh/tendermint/spn/pull/979?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=tendermint) ```diff @@ Coverage Diff @@ ## develop #979 +/- ## ======================================== Coverage 10.55% 10.55% ======================================== Files 275 275 Lines 66482 66482 ======================================== + Hits 7014 7016 +2 + Misses 59298 59297 -1 + Partials 170 169 -1 ``` | [Impacted Files](https://codecov.io/gh/tendermint/spn/pull/979?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=tendermint) | Coverage Δ | | |---|---|---| | [x/campaign/simulation/store.go](https://codecov.io/gh/tendermint/spn/pull/979/diff?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=tendermint#diff-eC9jYW1wYWlnbi9zaW11bGF0aW9uL3N0b3JlLmdv) | `84.45% <0.00%> (+1.35%)` | :arrow_up: |