[feature] Added silent parameter to the dap.repl.execute function to not repeat the command after execution.

**Example for Python** ```lua local repl = require('dap.repl') repl.commands = vim.tbl_extend('force', repl.commands, { custom_commands = { ["."] = function(expr) if not expr or expr:match("^%s*$") then repl.append('Usage: . <expression>') return end local wrapped = 'repr(' .. expr .. ')' repl.execute(wrapped, {context='repl', silent=true}) end, } }) ``` Execution in the repl: ``` . <variable> ``` to show a variable without meta information. I have tested this in python for the nvim-dap commit 6782b09. This is related to these issues: - https://github.com/mfussenegger/nvim-dap/issues/737 - https://github.com/mfussenegger/nvim-dap/issues/1062