fix: support output flag on tx commands (backport #9717) (#9772)

* fix: support output flag on tx commands (#9717)

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## Description

Closes: #9684

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- [ ] included the correct [type prefix](https://github.com/commitizen/conventional-commit-types/blob/v3.0.0/index.json) in the PR title
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- [ ] added a changelog entry to `CHANGELOG.md`
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(cherry picked from commit 9253503)

# Conflicts:
#	CHANGELOG.md

* Fix changelog

Co-authored-by: Sai Kumar <17549398+gsk967@users.noreply.github.com>
Co-authored-by: Amaury M <1293565+amaurym@users.noreply.github.com>

CHANGELOG.md

@@ -36,6 +36,9 @@ Ref: https://keepachangelog.com/en/1.0.0/
 
 ## Unreleased
 
+### Improvements
+
+* (cli) [\#9717](https://github.com/cosmos/cosmos-sdk/pull/9717) Added CLI flag `--output json/text` to `tx` cli commands.
 
 ## [v0.42.7](https://github.com/cosmos/cosmos-sdk/releases/tag/v0.42.7) - 2021-07-09
 

client/flags/flags.go

@@ -94,6 +94,7 @@ func AddQueryFlagsToCmd(cmd *cobra.Command) {
 
 // AddTxFlagsToCmd adds common flags to a module tx command.
 func AddTxFlagsToCmd(cmd *cobra.Command) {
+	cmd.Flags().StringP(tmcli.OutputFlag, "o", "json", "Output format (text|json)")
 	cmd.Flags().String(FlagKeyringDir, "", "The client Keyring directory; if omitted, the default 'home' directory will be used")
 	cmd.Flags().String(FlagFrom, "", "Name or address of private key with which to sign")
 	cmd.Flags().Uint64P(FlagAccountNumber, "a", 0, "The account number of the signing account (offline mode only)")